A group of guys and one girl are sitting together at a ball game.
During the game the guys notice that the girl knows just as much about the
game as themselves, and are really impressed.

After the game they ask her how is it that you know so much about
baseball?

She says, Well, I used to be a guy and got a sex change.

The guys are amazed, but very curious about the process. what was the most
painful part of the process? Was it when they cut off your penis?

That was very painful, but was not the most painful part.

Was it when they cut off your balls?

That was very painful, but was not the most painful part.

What was the most painful part?

The part that hurt the most was when they cut my salary in half!

[Ed: I thought this was a nice variant of this usually anti-female joke, although
I think the other one (when they scooped out half my brains) is
funnier for its sheer offensiveness. ]