Joke #963

Joke: A chemistry teacher told his student he had a lot of potential. Then he dropped him off of the roof.

Joke: Why can't you ask a chemist to make you a Pb and J sandwich?

Joke: What do you call a secret agent compound?

Joke: What's Batman's favorite element?

Joke: Water: Oleic acid, I don't think I can be with you.
Oleic acid: Is it because I'm fat?

Joke: Knock knock!
Who's there?
Aldehyde!
Aldehyde who?
...
Must have been a leaving group.