Miss Cellania has the classic "a whole bunch of scientists walk into a bar ..." post. It's an oldie but goodie, and I couldn't help but laugh at some of them. For example:
Rene Descartes was sitting at a bar. The bartender came over and asked if he would like another drink. He replied, "I think not." And he vanished.
Heisenburg was also sitting at the bar. After Descartes vanished in a puff of smoke, the bartender walked over to him and asked, "Did you see that?"
To which Heisenberg replied, "I can't be certain."
The bartender then noticed Einstein was there. So he asked him if he could believe what had happened. Einstein replied, "It's all relative."
Then the bartender noticed that Carl Sagan was there. He walked over to him and asked, "Can you believe that all these famous people are here in THIS bar?"
Sagan replied, "No. Why, there must be BILLIONS and BILLIONS of bars out there."
Read the rest here: Link