
I already thought about that question, but I forget the answer.
Meaning: I am more famous than you.

That's a very interesting question, let me think about it.
Meaning: You are more famous than me.

That's a very interesting question, let's write a joint paper about it.
Meaning: We are equally famous, but I am lazier.
(Adapted from Glossary of common math terms, by Steve Krantz, in the
Mathematical Intelligencer 16(1), 1994.)