Quote from Jill in Bye Bye Birdie
Brad: Well, why do I have to learn how to multiply compound fractions? I'm never gonna use them. Tim: You use 'em every day. Brad: When? Jill: Well, like, when I go to the grocery store and I buy a pound and a half of cheese. Brad: Yeah, but you're not multiplying anything. Jill: Well, you didn't let me finish. Tim: Why don't you finish that? Jill: Well, I buy a pound and a half of cheese and then I multiply that by... a gallon and a half of milk. Brad: But why would you do that? Jill: Because... Because I'm... making cheese milk. Jill: Now go get your math book. We are going to teach you how to multiply compound fractions. Tim: Couldn't we just punish him? Send him in his room without his cheese milk? [Jill laughs]