Sam: I'm not doing ANY math over Christmas break.

Mrs. B: Really? Aren't you going to your grandma's house in California?

Sam: (suspicious) Yeeeeaaaaaaaah.

Mrs. B: So if your plane leaves at 12:15 in the afternoon, and it takes a half an hour to get to the airport, and you have to check in one hour early, what time to you need to leave your house in order to not miss your plane?

Sam: Hey, look at that! Math even helps us take vacations!