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		<updated>2026-04-26T14:28:10Z</updated>
		<subtitle>User contributions</subtitle>
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	<entry>
		<id>https://www.explainxkcd.com/wiki/index.php?title=842:_Mark&amp;diff=68258</id>
		<title>842: Mark</title>
		<link rel="alternate" type="text/html" href="https://www.explainxkcd.com/wiki/index.php?title=842:_Mark&amp;diff=68258"/>
				<updated>2014-05-28T21:49:06Z</updated>
		
		<summary type="html">&lt;p&gt;UniTrader: /* Explanation */  -&amp;gt; added a possible explaination why cueball didnt figure out the joke&lt;/p&gt;
&lt;hr /&gt;
&lt;div&gt;{{comic&lt;br /&gt;
| number    = 842&lt;br /&gt;
| date      = January 3, 2011&lt;br /&gt;
| title     = Mark&lt;br /&gt;
| image     = mark.png&lt;br /&gt;
| titletext = I'm a solipsistic conspiracy theorist. I'm sure I must be up to something, and I will not stop until I find out what.&lt;br /&gt;
}}&lt;br /&gt;
&lt;br /&gt;
==Explanation==&lt;br /&gt;
The punchline refers to an old grade school/middle school prank (Urban Dictionary: [http://www.urbandictionary.com/define.php?term=pen15+club pen 15 club], [http://www.urbandictionary.com/define.php?term=pen15 Pen 15].) You'd typically walk up to an unsuspecting schoolmate and ask him if he wants to join the Pen Fifteen club. You'd tell him that to join, you merely have to write the club name on him. You'd then write &amp;quot;PEN15&amp;quot; on his hand or arm, and everyone would laugh at him because it looks like &amp;quot;Penis&amp;quot;. In this case, [[Cueball]] fell victim to this prank as a child without ever figuring out the joke (maybe because they got him to write it himself on his arm and he literally wrote &amp;quot;Pen Fifteen&amp;quot; instead of &amp;quot;Pen15&amp;quot;). Later on, he created meaning and conspiracy out of two completely unrelated, coincidental events, and resultantly burned someone's house down. All because he so badly wants to be part of something bigger.&lt;br /&gt;
&lt;br /&gt;
As for the title text, {{w|solipsism}} is the philosophical idea that only your own mind is sure to exist while other minds can't be really known and so those other minds are not proved to be real.&lt;br /&gt;
&lt;br /&gt;
==Transcript==&lt;br /&gt;
:[Cueball and a child are talking.]&lt;br /&gt;
:Child: What's that on your arm?&lt;br /&gt;
:Cueball: The mark of a secret society.&lt;br /&gt;
&lt;br /&gt;
:Child: If it's secret, why tell me-&lt;br /&gt;
:Cueball: Because I know nothing. I can't betray them because I don't know who they are. I was chosen by an agent 20 years ago. That was my first and last direct contact. It's safer that way.&lt;br /&gt;
&lt;br /&gt;
:Six years later I found a piece of paper in the street with an address on it. The next day I found a can of kerosene in my garage that I'm sure I never bought.&lt;br /&gt;
:[The panel represents these actions by highlighting the mentioned objects in a world of gray.]&lt;br /&gt;
&lt;br /&gt;
:I didn't know whose house it was. I just knew that I'd been given my orders. And I carried them out.&lt;br /&gt;
:[A dark figure is silhouetted against a flame.]&lt;br /&gt;
&lt;br /&gt;
:Cueball: I don't know who or what we're fighting.&lt;br /&gt;
:Cueball: Maybe we're the bad guys.  &lt;br /&gt;
:Cueball: It doesn't matter to me.&lt;br /&gt;
&lt;br /&gt;
:Cueball: It's enough to know that there are forces working beneath the chaos of life, and I'm a ''part'' of them.&lt;br /&gt;
&lt;br /&gt;
:Cueball: That whatever this &amp;quot;pen fifteen&amp;quot; club is,&lt;br /&gt;
:Cueball: I'm ''in'' it.&lt;br /&gt;
&lt;br /&gt;
{{comic discussion}}&lt;br /&gt;
[[Category:Comics featuring Cueball]]&lt;br /&gt;
[[Category:Comics with color]]&lt;br /&gt;
[[Category:Penis]]&lt;br /&gt;
[[Category:Philosophy]]&lt;/div&gt;</summary>
		<author><name>UniTrader</name></author>	</entry>

	<entry>
		<id>https://www.explainxkcd.com/wiki/index.php?title=Talk:1363:_xkcd_Phone&amp;diff=66525</id>
		<title>Talk:1363: xkcd Phone</title>
		<link rel="alternate" type="text/html" href="https://www.explainxkcd.com/wiki/index.php?title=Talk:1363:_xkcd_Phone&amp;diff=66525"/>
				<updated>2014-05-02T04:11:21Z</updated>
		
		<summary type="html">&lt;p&gt;UniTrader: Created page with &amp;quot;Where can i get one of these? :D ~~~~&amp;quot;&lt;/p&gt;
&lt;hr /&gt;
&lt;div&gt;Where can i get one of these? :D [[User:UniTrader|UniTrader]] ([[User talk:UniTrader|talk]]) 04:11, 2 May 2014 (UTC)&lt;/div&gt;</summary>
		<author><name>UniTrader</name></author>	</entry>

	<entry>
		<id>https://www.explainxkcd.com/wiki/index.php?title=1192:_Humming&amp;diff=64811</id>
		<title>1192: Humming</title>
		<link rel="alternate" type="text/html" href="https://www.explainxkcd.com/wiki/index.php?title=1192:_Humming&amp;diff=64811"/>
				<updated>2014-04-07T20:32:47Z</updated>
		
		<summary type="html">&lt;p&gt;UniTrader: /* Trivia */  - added related Comoc 1022&lt;/p&gt;
&lt;hr /&gt;
&lt;div&gt;{{comic&lt;br /&gt;
| number    = 1192&lt;br /&gt;
| date      = March 29, 2013&lt;br /&gt;
| title     = Humming&lt;br /&gt;
| image     = humming.png&lt;br /&gt;
| titletext = I'm so bad at carrying a tune, those 'find a song by humming its melody' websites throw an HTTP 406 error as soon as I start to hum.&lt;br /&gt;
}}&lt;br /&gt;
&lt;br /&gt;
==Explanation==&lt;br /&gt;
Services like {{w|MusicBrainz}} and {{w|SoundHound}} can detect a recorded song's {{w|acoustic fingerprint}} and match it with an existing song. This lets them identify the title and artist of an unnamed recorded musical extract. In this comic, [[Megan]] hacks the acoustic fingerprint database to add her own entry with a message to [[Cueball]], in which she asks him to buy [[1022|cat food]].&lt;br /&gt;
&lt;br /&gt;
HTTP error code 406 means Not Acceptable. When a client requests data from a server, the client lists the data formats that it can accept. If a server is unable to provide data in any format that the client accepts, the server returns error 406 Not Acceptable. For example, this can occur if a client requests XML but the server supports only JSON. In the comic, the standard meaning of the error message is ignored and the text &amp;quot;Not Acceptable&amp;quot; is taken literally: The server is offended by the author's humming.&lt;br /&gt;
&lt;br /&gt;
==Transcript==&lt;br /&gt;
:[Megan is humming a tune.]&lt;br /&gt;
:Cueball: Hey.&lt;br /&gt;
:Cueball: What's that?&lt;br /&gt;
:[Megan is still humming the same tune.]&lt;br /&gt;
:Cueball: What are you humming?&lt;br /&gt;
:Cueball: Should I know the tune?&lt;br /&gt;
:Cueball: ...Hmm...&lt;br /&gt;
:[Cueball gets out his phone and opens up a music recognition program.]&lt;br /&gt;
:Phone: Identify song&lt;br /&gt;
:Phone:   Recorded&lt;br /&gt;
:Phone: &amp;gt; Live [beta]&lt;br /&gt;
:Phone: Identifying...&lt;br /&gt;
:[A zoom in on the phone screen. An album cover with a picture of Megan on it.]&lt;br /&gt;
:Positive match:&lt;br /&gt;
:''Check it out!''&lt;br /&gt;
:By I hacked the audio fingerprint database&lt;br /&gt;
:Feat. MEEEEEE&lt;br /&gt;
:Track: We're out of cat food (pick some up?)&lt;br /&gt;
&lt;br /&gt;
==Trivia==&lt;br /&gt;
*[[1199: Silence]] further explores song identification.&lt;br /&gt;
*[[1022: So It Has Come To This]] is also about running out of Cat Food.&lt;br /&gt;
&lt;br /&gt;
{{comic discussion}}&lt;br /&gt;
[[Category:Comics featuring Megan]]&lt;br /&gt;
[[Category:Comics featuring Cueball]]&lt;br /&gt;
[[Category:Music]]&lt;/div&gt;</summary>
		<author><name>UniTrader</name></author>	</entry>

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