A fellow passed a house with a little red light burning in front, so he stepped inside. There was nothin in sight but an empty bare hallway, with 2 doors reading "Over 35" and "Under 35".
He decided to be truthful and entered the door that said "Over 35". He found himself in another empty hallway, this one with 2 doors that read, "Over 8 inches" and "Under 8 inches".
Truthful again, he went through the "Under 8 inches" door and found himself in another empty hall, with 2 more doors reading, "Once a night" and "Many times a night".
Still wanting to be truthful, he entered the door marked "Once a night" and found himself back out on the street.
The moral of this story is "Always tell the truth and you'll never get screwed."