A man with a glass eye is here to see you
Nurse: Doctor, there is a man in the waiting room with a glass eye named Brown.

Doctor: What does he call his other eye?

Are caterpillars good to eat?
Johnny: Daddy, are caterpillars good to eat?

Father: Have I not told you never to mention such things during meals!

Mother: Why did you say that, Junior? Why did you ask the question?

Johnny: It's because I saw one on daddy's lettuce, but now it's gone.