Teacher: Does anybody need to go to the bathroom? Class: *no

Teacher: Does anybody need to go to the bathroom?

Class: *no one answers*

30 minutes later-

Me: *raises hand* May I please go to the bathroom?

Teacher: *replies angrily* I asked if anyone had to go to the bathroom 30 minutes ago! Why didn't you just go then?

Me: My pee decides when to come, I do not decide for it. And excuse me for not being able to pee on command.