Possibly one of the most confusing experiences imaginable.
Not to be confused with a "white Angel"
Some people believe that the ghosty is what gets you stoned, but that cannot be accurately confirmed.
"I greened out from a ghosty once!"
Bring a girl back to your room and proced to have sex from behind, ensure she is facing away from the door and window....half way through allow your mate to take over whilst you slip outside, walk round to the window and knock away...as she turns around to see your face outside realising what is happening...