(Greg comes homes with a bruise on his arm)
Carol: Oh, Greg!
Greg: Mom, it's just a bruise.
Carol: That is the biggest bruise I have ever seen in my entire life! See, this is exactly why I was so worried about you playing football!
Greg: Mom, that's not from practice. I bumped my arm in math class.
(cue laugh track)
Carol: Oh, well...
Greg: I'd be happy to quit math if you think it's too dangerous.