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.

A farmer and his girlfriend...
A farmer and his girlfriend were out for a stroll in the fields when they came across a cow and a calf rubbing noses."Boy," said the farmer, "that sure makes me want to do the same.""Well, go ahead," said his girlfriend. "It's your cow."