On tour bus from Akasa Lake to Tokyo.
Mom: [to me] Why is it that you didn't buy any ice cream today?
Dad: You must be out of money. Are you?
Me: Well, yes, I can't find a Japanese ATM that accepts American cards. But that's not the reason.
Me: Is it that unusual that I didn't buy ice cream today?
Both parents: [in unison] Yes.
Me: Fine, then wasn't yesterday unusual too, in that I ate only ONE ice cream?