Setting: in a bank branch
Teller: How old is she?
Customer: She’s 4, and we have another at home 2½.
Teller: I have a 1½. We might have another when this one is potty trained.
Child: Mommy, why are we here?
Customer: I’m getting a check.
Child: Looks puzzled by the unfamiliar transaction.
Customer: Realizes the setting. Emily, when we go to the bank we get a C-H-E-Q-U-E. We get C-H-E-C-K-E-D when we go to the doctor.
A piece of paper and a lollipop appear to cure all.