We've recently resurfaced the tennis courts, and the pigments used have been rubbing off onto the tennis balls. I'm talking to a kid who just got back from vacation and hasn't used the new courts yet:
Me: And the color's been coming off the courts so don't be surprised if you end up with blue balls!
Luckily, the innuendo flew right over the kid's head. Disappointingly, it also whizzed right by his father. I don't know if horror or amusement would have been better, but some sort of reaction from dad would have been hilarious.