Those are pretty great, but the funniest math joke ever is this;

Q: Why do Computer Scientists get Halloween and Christmas mixed up?
A: Because Oct. 31 = Dec. 25.

Bayesians do it with improper priors.
Statisticians probably do it.

And it's kinda math, kinda science, but the best joke ever is this;

Q: Why did the chicken cross the Möbius Strip?
A: To get to the same side.

*Paroxysms of laughter* Ow my kidneys.