1388: Subduction License

Explain xkcd: It's 'cause you're dumb.
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Subduction License
'Dude, why can't you just be a normal roommate?' 'Because I'm coming TOWARD you!'
Title text: 'Dude, why can't you just be a normal roommate?' 'Because I'm coming TOWARD you!'


Ambox notice.png This explanation may be incomplete or incorrect: A reference that links to the fact that "normal" has a special meaning in structural geology is needed.
If you can address this issue, please edit the page! Thanks.

In structural geology, subduction is the mechanism by which one tectonic plate disappears under another. This process usually creates a mountain range on the second tectonic plate. (In some cases it will take the form of an island arc or a volcanic arc)

In this comic, Beret Guy is very happy because he has just received his subduction license. His roommate Cueball very reasonably asks him: Your what?. But instead of answering him, Beret Guy begins to move towards him in their small room. It turns out that the license has literally enabled him to start a subduction: As he moves towards Cueball, he slowly sinks under the floorboard of the room, and in this process he creates a small mountain range on the floor. In the end, much to Cueball's consternation, these mountains turn his desk and chair over. Cueball actually falls out of the frame in the final panel, where Beret Guy is already halfway down beneath the floor.

The title text plays on the double meaning of the word "normal", which in structural geology refers specifically to mountain-building faults that form when plates or other crustal blocks relax away from one another (e.g., the Teton Range). However, since in subduction the plates are necessarily moving TOWARD one another (as noted in the roommate's response in the title text), mountain building is not due to normal (i.e., extensional) faults, but rather to compressional faults. It is typical for Beret Guy to act like this and also for him to misunderstand normal questions.

These types of atypical licenses has been mentioned previously in 410: Math Paper, but here a license was obtained instead of lost.

A thrust fault is a type of compressional fault that is itself part of the extended geologic/erotic play on words that drives 1082: Geology. Here in this comic, I'm coming toward you may reflect a confusion, in Beret Guy's mind, between subduction and seduction.


[Beret Guy is looking at some mail he has received while Cueball is at his computer desk at the other side of the room.]
Beret Guy: Sweet! I finally got my subduction license!
Cueball: Your what?
[Beret Guy starts sinking into the ground, causing it to ripple.]
Cueball: ...What are you doing?
[Beret Guy sinks further, forming a miniature mountain range in front of him. Cueball is frantically trying to keep his computer steady as his desk tilts.]
Cueball: Stop it! Stop it!
[Beret Guy is waist-deep, and snow caps have formed on the mountains. Cueball is falling backwards from his desk, and the monitor unplugs itself from his computer.]
Cueball: AUGH!

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"In the end, much to Cueball's consternation, these mountains turn his desk and chair over. Cueball actually falls out of the frame in the final panel, where Beret Guy is already halfway down beneath the floor. This would not be possible in real life. [citation needed]" ...Hoping this is a joke...

Citation needed is a recurring joke on ExplainXKCD.[citation needed] PoolloverNathan (talk) 18:00, 19 January 2021 (UTC)

I'm assuming "subduction license" is being comically reinterpreted here from some other meaning. What is a subduction license, normally speaking? Jevicci (talk) 15:20, 30 June 2014 (UTC)

play on words with "production license".

Um, you're making it too easy to make me normal and rub away very fast (talk) (please sign your comments with ~~~~)

I'm thinking the closest real term to "subduction license" is probably "Subversion License" - Subversion being a popular source code repository system. (Edit: Created a new account) KieferSkunk (talk) 21:02, 30 June 2014 (UTC)

Nah, that's not it ... there's got to be some pun on license, or perhaps a term that sounds like -uction license. 23:14, 30 June 2014 (UTC)
Could be the seduction license he should have applied for instead. He wishes to seduce his roommate, and has applied for a license for this. However he misunderstood the word and has applied for the other license, and has also read about it on Wikipedia ;-) Kynde (talk) 13:31, 1 July 2014 (UTC)
Given Beret Guy's past and future expressions of unusual or impossible power, it's probably best to assume that it is literally a license that allows him to perform subduction. That it. -Pennpenn 05:59, 5 January 2016 (UTC)

Google supplies http://www.cafepress.ca/+subduction+license-plate-frames which offers "Subduction License Plate Frames", which I believe is an accidental verbal conjunction. I believe it's in the context of the web site selling a range of images and designs printed on various objects. In this case the object is a license plate frame, and the image is a diagram of subduction. Since the centre is cut out of the image in order to display the license plate, the combination is pretty useless. But, here it is, a subduction license plate frame, in which to place your subduction license. So why is that funny? Well, maybe it was the web site's special offer of the day, or, it was a Googlewhack. But now, a few days later, the Internet is awash with people asking "Why is 'subduction license' funny?" [email protected] 08:45, 5 July 2014 (UTC)

My second theory: by the time he sobered up and realised it wasn't funny after all, there wasn't time to draw a new comic. Although I could draw one of these in five minutes (lettering takes longer), so that doesn't work. Maybe he's ill, badly ill. [email protected] 08:45, 5 July 2014 (UTC)

My third theory: did someone make earthquakes illegal? Or make them legal with a license? It's in the news that scientists are satisfied with the evidence that licensed fracking is causing earthquakes in Oklahoma, but it seems to be pretty easy to get a license or permit to do fracking. But the news story appeared after this comic was published - if you get your geology news from regular newspapers. And obviously the question had been asked earlier. So, the comic may be based on that. [email protected] 08:45, 5 July 2014 (UTC)

Alternate explanation for the title text: A fault is a break between two blocks of the lithosphere (or the crust if you want to be more vernacular). The two blocks move in one of three ways: laterally side-by-side (making it a transform fault), away from each other (a normal fault) or toward each other (a reverse fault, which is the kind involved in subduction). If Beret Guy were normal, he'd have to be moving away from Cueball. Fewmet (talk) 15:15, 1 July 2014 (UTC)

Also, "AUGH!" reminds me of Peanuts: [[1]] 19:02, 14 February 2017 (UTC)Mandel

Why does the mini mountain range have snow on the peaks? 15:45, 26 April 2017 (UTC)

Because it's funny! -- The Cat Lady (talk) 20:18, 27 October 2021 (UTC)