Going down on a girl while she is on her period, the blood on the face of the man (or woman) giving head gives the appearance of the make-up on Heath Ledger's face when he played the Joker in "The Dark Knight."
A cocktail comprising of 3 or more prescription drugs, frequently used as an alternative to rohypnol, though in extreme cases has been know to result in an hero.
Two men in a club/bar:
"She's been playing hard to get all night."
"Yes but not for much longer - I just gave her a Heath Ledger surprise"