Rationality Jokes Thread

True story:

My son resisted cleaning up his toys but loved beating me at games. Once when he was three I took advantage of his competitive spirit by dividing his blocks into two piles, assigning one pile to him and the other to myself and then telling my son that we will race to see who puts away all of his blocks first. My son smiled, indicating that he was going to play my game, making me proud of my parenting skills.

At the contest’s start my son grabbed a bunch of my blocks, ran outside of his room and threw the blocks down our stairs. When he returned I laughed so hard that the game ended.

My son recently joined LessWrong.

Since, as you have noted, we have already had a joke thread, perhaps it would have been better to ask for, e.g. funniest rationality quotes or funniest LessWrong comments? Or perhaps make it more specific than the previous thread. For example, some jokes that are thought of as nerdy, math-y or intellectual are actually quite simple, as their reputation as intellectual is based on the subject matter they touch and not on the joke's "structure" itself (e.g. their humour derives from puns, cultural references, or parodies of the cultural references). In short, these are the jokes that, to paraphrase The Ig Nobel Prize description, make you think, and then laugh. On the other hand, some jokes might have mundane subject matter, but their structure may impress you more than the subject matter itself. These could be called jokes that make you laugh and then think. Obviously, there are many fewer jokes of the latter type. A couple examples that, I think, qualify, both taken from LessWrong comments:

From here

Once there was a miser, who to save money would eat nothing but oatmeal. And what's more, he would make a great big batch of it at the start of every week, and put it in a drawer, and when he wanted a meal he would slice off a piece and eat it cold; thus he saved on firewood. Now, by the end of the week, the oatmeal would be somewhat moldy and not very appetising; and so to make himself eat it, the miser would take out a bottle of good whiskey, and pour himself a glass, and say "All right, Olai, eat your oatmeal and when you're done, you can have a dram." Then he would eat his moldy oatmeal, and when he was done he'd laugh and pour the whiskey back in the bottle, and say "Hah! And you believed that? There's one born every minute, to be sure!" And thus he had a great savings in whiskey as well.

-- Norwegian folktale.

Another one from here:

"“It seems a Christian missionary was visiting with remote Inuit (aka, Eskimo) people in the Arctic, and had explained to this particular man that if one believed in Jesus, one would would go to heaven, while those who didn’t, would go to hell.

The Inuit asked, “What about all the people who have never heard of your Jesus? Are they all going to hell?’

The missionary explained, “No, of course not. God wants you to have a choice. God is a merciful God, he would never send anyone to hell who’d never heard of Jesus.”

The Inuit replied, “So why did you tell me?”

Well, the second one might remind some people a local cultural reference, but it is definitely not a part of the joke itself.

Three bystanders walk into a bar. The bartender asks, "Does anyone want a drink?"

"So, I threw a party for time travelers last week. It was awful. Nobody showed up."

"Well, Did you invite anyone?"

"Not yet."

The only time the word incorrectly isn't spelled incorrectly is when it's spelled incorrectly.

Showerthoughts

"Why did you become an economist?"

"I forgot to check my second order conditions."

An infinite number of mathematicians walked into a bar. I'll have a beer, the first one said. I'll have half as much beer as the first mathematician said the second. I'll have half as much beer as the second mathematician said the third. The bartender looked at all of them, said you guys are jerks, and served them two beers.

Why didn't the chicken cross the road?

Antipredictions need no explanation.

An existentialist walks into a bar and orders a martini. The bartender say "Would you like an olive in that?", to which the existentialist responds "I think not", and promptly disappears.