O.K., I'm weird, but this is one of the things I love about reddit. Someone posted a thread titled "What's the most intellectual joke you know
3 logicians walk into a bar. The bartender asks "Does everyone want a beer?"
The first logician says "I don't know."
The second logician says "I don't know."
The third logician says "Yes!"
Explanation: If any one of the three logicians does NOT want a beer, the answer to the bartender's question is "No."
The first logician wants a beer, but doesn't know whether his two friends do. So he says "I don't know."
The second logician now knows that the first logician wants a beer, because if he didn't he would have said no. And though he does want a beer, the he still doesn't know whether the third logician wants a beer. So he says "I don't know."
The third logician now knows that the first two logicians want beer, because otherwise one of them would have said no. So, as he also wants a beer, he now knows that all three logician wants a beer. So he can say "Yes."
Source: I **** love meth
Of course, since they are logicians, the first one should have deduced that all three unquestionably would want beer, and so should have said "Yes!".