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 group of chess enthusiasts had checked into a hotel...
A group of chess enthusiasts had checked into a hotel,and were standing in the lobby discussing their recent tournament victories. After about an hour,the manager came out of the office and asked them to disperse."But why?", they asked, as they moved off."Because," he said, "I can't stand chess nuts boasting in an open foyer."