Two nights ago, the three kids were in the bathtub at the same time.
Gabby: Why do Zack and Josh have the same bottoms?
Mommy: Because they are boys.
Gabby: Why is mine different?
Mommy: Because you're a girl.
Gabby: Is it like that so we can tell the difference?
Mommy: Yes, that's the reason. You're one smart little girl.
Guess it's time for separate baths.