This is one of my favorites:
One entry per answer. (This is in the vein of the Stack Overflow question What’s your favorite “programmer” cartoon?.)
P.S. Do not hotlink the cartoon without the site's permission please.
Another one from xkcd:
Knuth Paper-Stack Notation: Write down the number on pages. Stack them. If the stack is too tall to fit in the room, write down the number of pages it would take to write down the number. THAT number won't fit in the room? Repeat. When a stack fits, write the number of iterations on a card. Pin it to the stack.
This is not a cartoon, but a joke worth mentioning:
A statistic professor travels to a conference by plane. When he passes the security check, they discover a bomb in his carry-on-baggage. Of course, he is hauled off immediately for interrogation.
"I don't understand it!" the interrogating officer exclaims. "You're an accomplished professional, a caring family man, a pillar of your parish - and now you want to destroy that all by blowing up an airplane!"
"Sorry", the professor interrupts him. "I had never intended to blow up the plane."
"So, for what reason else did you try to bring a bomb on board?!"
"Let me explain. Statistics shows that the probability of a bomb being on an airplane is 1/1000. That's quite high if you think about it - so high that I wouldn't have any peace of mind on a flight."
"And what does this have to do with you bringing a bomb on board of a plane?"
"You see, since the probability of one bomb being on my plane is 1/1000, the chance that there are two bombs is 1/1000000. This way I am much safer..."
"The bridge of life"
The 'Death' attempts to kill you at different ages using different sorts of weapons which are related to the "failure probability" at the corresponding age.
No one put up a cartoon from the cartoon guide to statistics. I like many of them from there and I used a number of them in one of my books. The one that seems to get the most laughs when I use it in a lecture is the one with the statistician going out on a first date. Their comments and thoughts about the making decisions on the menu with the statistician assessing probabilities and the woman just choosing what she likes makes it really hilarious.
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