Q: What do you call a tooth in a glass of water?
A: A one molar solution.

Q: How many moles are in guacamole?
A: Avocado's number.

What amusement does this diagram represent?

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A ferrous wheel

Here's one for the chemists;

Organic chemistry is difficult. Those who study it have alkynes of trouble.

I don't know. I always thought it was pretty basic.

All your bases are belong to us.

A-u; Get away from my Gold!
C-u later copper!
HeHe I made you talk like a little boy
Anyone know any jokes about sodium? Na
Don't forget to P-b 4 you go to lead!

Ammonia going to say this once, but it looks like you covered all the bases.

Knock that off, or alcohol the cops!

It getting really ether-eal in here.

K, but I really don't think calling the Cu's is necessary. I didn't mean to create such a reaction. Maybe I'm just out of my element.

Now you are really going to compound the problem!!

Whenever my wife says she has lost weight I tell her to look behind her because I think I found it.

...after which you sleep on the couch?

Is it hard to get a good shave with all those cuts and bruises on your face?

The broken arm is the real problem here.

Quite true, but having the top of your head shaped like a frying pan is no picnic, either.

It must be a difficult problem to iron out.

Your students were lucky to have you.