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Latest revision as of 09:33, 16 March 2026

Welcome to the explain xkcd wiki!
We have an explanation for all 3249 xkcd comics, and only 69 (2.1%) are incomplete. Help us finish them!

 Go to this explanation

Latest comic[edit]

Bottle
"I know it seems impossible, but the trick is that I sailed in here when I was very young."
Title text: "I know it seems impossible, but the trick is that I sailed in here when I was very young."

Explanation[edit]

Ambox warning blue construction.png This is incomplete:
This page was BOTtled recently. Don't remove the cork too soon. If you can fix this issue, edit the page!

This comic shows a life sized ship in a bottle sailing along with other sail boats in the sea. The humor comes from the surreality of the situation.

In this comic, Beret Guy is inside a ship in a bottle. Cueball and Megan are in a sail boat to his left, while Ponytail is alone in a gaff rig to his right. A common question regarding a ship-in-a-bottle is how the model ship was put inside the bottle, due to the small size of the opening in the bottle compared to the ship. The answer is often that the ship was assembled (or at least partially unfolded, from more compact original components assembled outside) within the bottle. The components are small enough to pass through the neck of the bottle, and the final assembly is likewise done through the neck, usually the most awkward task. Of course, toy boat assembly is not comparable to real or life-sized ship construction, and bottles are almost never big enough to stand up in, with necks large enough to climb in and out through if required.

The title text alludes to this, by saying that Beret Guy, when he was smaller, sailed the boat inside the bottle while he was still able to fit through the entrance. This is similar to the way some brands of pear brandy are sold in bottles containing entire pears. These are produced by attaching the bottle to a young fruit and letting it grow to full size inside. This explanation fails to address that Beret Guy would fit through the neck of such a bottle relatively easy, on his own; but the boat, being made from non-living materials, would not have grown inside the bottle, and it is unlikely to have ever been a smaller boat carrying a smaller Beret Guy, and in a manner that both together could have sailed into the bottle. On the other hand, it would probably be easier for someone inside the bottle to have assembled components of a ship there than for that assembly to be done from outside. This would especially be true of a seaworthy vessel of a size to carry a passenger, rather than a mere model. But it’s possible that he used one of his many strange powers… Also, given the definition of boat explained in the earlier comic 2043: Boathouses and Houseboats ("a ship, by most definitions, carries boats"), Beret Guy's vessel is merely a boat.

The water level in the free-floating bottle is lower than the water outside. This is because the bottle will sink until the weight of the bottle and its contents (the water, the boat, and Beret Guy) equals the weight of the water displaced by the bottle. The weight of the 'missing' water in the bottle (the layer of air between the two surface levels, including the corresponding volume of air displaced by the boat) is consequently equal to the weight of the whole glass bottle. If you added water to the bottle in an attempt to make the inside and outside water levels the same, the bottle would contain less buoyant air and just sink deeper to misalign the surfaces again. Keep repeating this, and the buoyancy becomes less than zero (unless the inherent buoyancy of Beret Guy and his boat, now forced into the bottle's 'ceiling', still possess enough intrinsic support) at which point the bottle would sink.

As well as the question as to how on earth Beret Guy and the boat got in the bottle, there's another oddity. The bottle appears to be keeping pace with the boats on either side, impliying it is somehow propelling itself long despite lacking an engine, a sail, or any other method of propulsion. This could mean the bottle shares one of Beret Guy's strange powers. Possibly though, as Beret Guy seems to also be sailing within the bottle (which is also impossible, as it would lack airflow within there, unless it has it's own wind system. This is very likely, as the cork would prevent all airflow anyway, meaning Beret Guy would quickly die without his own source of airflow) he could be somehow powering the boat through that. He has powered up random objects in strange ways before, after all.

In practice, the bottle is horizontally unstable. The weight of the bottle is not equal along its length (it appears heavier at the neck), and the buoyancy at each point will not equal the weight at that point. This is also true of the boats in the cartoon; the difference is that in the bottle much of the weight is the water which is free to move. If the neck of the bottle goes down (to increase the displacement to balance the weight), the water will move to the front of the bottle. This increases the weight at the front which will force the front even deeper. This will continue until the bottle is floating vertically. Beret Guy's boat would appear to fit in the width of the bottle so everything will be fine. This effect (known as the 'free surface effect') has real implications for ships with open decks, such as car ferries, and has been implicated in several disasters such as the 'Herald of Free Enterprise', the 'Princess Victoria', and the 'Estonia'. So the bottle is ridiculously impractical and the only thing it would do would be protecting the people riding the ship - though not very much there either, as the bottle is likely made of glass, as giant boat-carrying bottles normally are. And in fact if it was to break then the hole made would make a bottleneck for the way out (pun not intended), so any attackers would have the advantage there as well.

Transcript[edit]

Ambox warning green construction.png This is one of 44 incomplete transcripts:
Don't remove this notice too soon. If you can fix this issue, edit the page!
[Three small single-masted sailboats are shown (the right one in a gaff rig), all sailing towards the right. The ones on the left and right are on the ocean, while the one in the middle is contained completely by a large bottle. On the left, Cueball and Megan are in one boat; Cueball is sitting near the stern, possibly holding the tiller, while Megan is before the mast. In the middle, Beret Guy is before the mast in the boat that's inside the giant bottle, with a cork plugging the screw top bottleneck. On the right, Ponytail is directly aft of the mast of the third boat. All the boats are sitting on the water with ripples on the surface, but the water level in the bottle is lower than the rest.]

comment.png  Add comment      new topic.png  Create topic (use sparingly)     refresh discuss.png  Refresh 

Discussion

Make changes, try things out, or just have fun with the wiki here! Just leave everything above the line alone, please.


This is a test. PoolloverNathan[stalk the blue seas] 20:48, 16 March 2021 (UTC)

This is not. —While False (museum | talk | contributions | logs | rights | printable version | page information | what links there | related changes | Google search | current time: 11:44) 18:38, 17 November 2022 (UTC)
A foreign student asked me to help fight against his math teacher. That was unusual. He was in that class for just a couple of weeks. The teacher's phone number was sent to me. The student asked me to spam-call the teacher. 172.71.155.55 22:58, 18 September 2023 (UTC)

here i'm just messing around in html, ignore this

furhhfghure guyrburgryhuyvfr "rvhru"

interesting way of writing quotations xd

hmmm this one of putting "<p>" in a line break will come in handy for when i want it to start at the same place than the first line

Please beware that <p> on mediawiki also disables automatic paragraph breaks, so you need a closing </p> or you'll break automatic paragraph formatting for the rest of the page. Zmatt (talk) 22:06, 31 July 2024 (UTC)

edit: da hek did that "</div>" come from An user who has no account yet (talk) 14:14, 13 October 2023 (UTC)

hi uh its hard to get here. is this a reference to undocumented feature??? hmm... this is interesting.
108.162.241.216 02:05, 23 November 2023 (UTC)

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yum yum [citation needed]

Hiuiedeixgeyceiyedhcdiedcve {{trout}}

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     19:02 

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Talk:442: xkcd Loves the Discovery Channel‎‎ (2 changes | history) . . (+74). . [82.132.239.222‎; 129.222.167.120‎]

     

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1 May 2026

N    21:36 

Talk:3240: Bottle‎‎ (21 changes | history) . . (+4,309). . [SovereignFinn‎; TheusafBOT‎; PRR‎; 42.book.addict‎; 81.179.199.253‎; 63.229.212.46‎; 37.59.41.98‎; 31.16.254.255‎; 24.244.70.174‎; Commercialegg‎ (2×); Lettherebedarklight‎ (2×); 2a02:6b6f:e226:b00:70bf:8626:d782:45be‎ (2×); BorQhue del Sol‎ (3×); Barmar‎ (3×)]

     

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