Puns, pick-up lines, anti-jokes, whatever. List them here.
NOTE: Nothing sexist, racist, ableist, etc.; while it might not seem offensive to you, or even to me, it could be to someone else, so be considerate and keep it in taste.
I'll start with a few of my personal favourites.
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What do you do with dead chemists?
You barium!
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Two men walk into a bar. The third one ducks.
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How did the scarecrow win a Nobel Prize?
He was out standing in his field.