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Doctor, doctor, my sister here keeps thinking she's invisible.
Doctor: Which sister?

Fred: My sister wants to be an actress.
Harry: Is she pretty?
Fred: Well, put it this way, she'd be perfect on radio.

Fred: It's hard for my sister to eat.
Harry: Why?
Fred: She can't bear to stop talking.

My sister went on a crash diet.
Is that why she looks a wreck?"