Jokes about anime lovers

The teacher asked: You invited the girl you like to have dinner. How should I say it politely when I want to go to the toilet?

Classmate A: I'm going to pee! Teacher: It's not polite at all.

Classmate B: I'm going to the bathroom until I come back. Teacher: Well, that's good, but there are more polite ones.

Classmate C: Excuse me, I'm going to meet a good friend. If possible, I hope to have the opportunity to introduce him to you tonight. ...