So what's the difference between numbers and odd numbers? (read the entire question before answering)?

Well, if you're trying to trade in $100 in food stamps to Shifty Tony in exchange for a pack of cigarettes, be careful if he wants you come pick up the cigarettes in the back of his van; you know, the one with the water bed and video camera. If you go, the days of your butt's virginity are numbered, which would be quite odd.