jokes
TEACHER: Didn't you promise to behave?STUDENT: Yes, Sir.TEACHER: And didn't I promise to punish you if you didn't?STUDENT: Yes, Sir, but since I broke my promise, I don't expect you to keep yours.
HAROLD: Teacher, would you punish me for something I didn't do?TEACHER: Of course not.HAROLD: Good, because I didn't do my homework.