Would You Like One?

Professor: I have three children: 15, 13, and 7.
Female student: Oh, I don't think I could have three.
Male student: Yeah, with two you can do person-on-person defense, but with three you need zone.
professor: You have a point.

http://eavesdropdc.blogspot.com/2007/08/just-reminder-that-football-season.html

Overheard by: Ian