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.

3 Hunters in the Woods
There are 3 hunters in the woods, they're all telling each other what they're are going to shoot. The first one says he's going to get a buck. So he goes out and comes back with a buck. Then the other 2 hunters ask how he did it and he says, ''I see tracks I follow tracks I get buck''. So the second hunter says "I'm gonna get a doe." So he goes out and comes back with a doe. Then the 3rd hunter asks him how he did it. The 2nd hunter says, ''I see tracks I follow tracks I get doe''. So the 3rd hunter says, ''I'm just gonna shoot at anything I see''. So he goes out and comes back half a day later all beaten bruised bloody and totally trashed. And the other two hunters ask what happened and he says, ''I see tracks I follow tracks, I get hit by train!''