A) Hand in Blackjack that you know you've are going to bust/already have busted but you keep asking to be hit.
B) In poker where you have no chance of winning. May continue playing anyway.
C) Any musical note that no one seems to know how to play.
A) Person A: Dude, you kept hitting. You have 36!
Person B: Just a tricky richard!
B) Person A: I fold, I've got a tricky richard.
C) Person A: Do you know what that note is?
Person B: No. It must be a tricky richard