What has 8 legs…

What did one eye say to the other? Between us, something smells.

Don't tell me the sky is the limit when there are footprints on the moon.

Congrats on proving that getting older doesn’t mean getting wiser.

I don't think inside the box and I don't think outside the box... I don't even know where the box...

Why did the physicist break up with the biologist? There was no chemistry.