A salesman telephoned a household, and a four-year-old answered.

Salesman: May I speak to your mother?

Child: She is not here.

Salesman: Well, is anyone else there?

Child: My sister.

Salesman: O.K., fine. May I speak to her?

Child: I guess so.

There was a long silence on the other phone. Then....

Child: Hello?

Salesman: It’s you. I thought you were going to call your sister.

Child: I did. The trouble is: I can’t get her out of the playpen.