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Remind's me of the time I asked the librarian if she had any books on Pavlov's Dog or Schroedinger's Cat. She said "It rings a bell, but I'm not sure if they're there"

Hahahahahaha! That's a good one!

An Inspector, and two chemists walk into a bar. The bar keep asks the first chemist, "what'll you have?"
First chemist says, "H2O."
Second chemist says, "H2Otoo."
Immediately the Inspector arrests the first chemist, foiling his murder plot.