A blind man goes on a trip in his private jet and, at 20,000 feet, the pilot calls him into cockpit and tells him he has chest pains and suddenly dies of a heart attack.
The blind man feels the plane nose-diving and rocking violently so he drags the pilot out of his seat straps himself in, fumbles around to find the radio and calls into it, "Mayday! Mayday!"
Ground control hear the call for help and enquire as what the problem is.
The Blind man replies, "I am blind and alone in a plane, the pilot is dead and I'm flying upside down. Mayday! Mayday!"
Ground control says, "Calm down sir. Just to clarify, you are blind so how the hell do you know you are flying upside down?"
The blind man replied, "Because the shit is running up my back."