Two voices, one male and one female, overheard on a plane: "I think everyone's asleep, let's go! This one's empty ... no-one's looking... you go in first.
It's a bit cramped. Have you got the condom? Quick - put it on."
Static on the loud speaker; "This is the captain speaking, to those two people in the rear toilet, we know what you're doing and it is expressly forbidden by airline regulations!
Now put those cigarettes out and take the condom off the smoke detector!"