An invisible man is here to see you
Nurse: Doctor, there is an invisible man in your waiting room.

Doctor: Tell him I can't see him now. Next.

Mothers....
A man calls his mother in Florida. "Mom, how are you?""Not too good,"says the mother. "I've been very weak."The son says, "Why are you so weak?"She says, "Because I haven't eaten in 38 days."The man says, "That's terrible. Why haven't you eaten in 38 days?The mother answers, "Because I didn't want my mouth to be filled with food if you should call."