Where'd they all go?

Overheard while a certain someone took their daughter to cheerleading/gymnastics class:

Dad: Why are there no cars in the parking lot?

Daughter: I don't know? Oh wait! Remember, it's spring break so there's no classes tonight.

Dad: So you mean we don't have to go tonight.

Daughter: Well, yeah ( like dad hasn't a clue ).

Dad: Well then I guess we don't need to go.

Daughter: Duh . . .