A few from Loony Tunes
Ehhh... What's Up, Doc?
Play: After suffering any mental/emotional effect. (Fear, Command, Bluff, Intimidate, Daze, etc)
Effect: You are completely unimpressed, it does nothing to you.
Duck Season! Wabbit Season!
Play: When attacked by an opponent, who threatens other opponents.
Effect: Due to your fancy maneuvers, this round they attack someone on their side. (If plausible, their boss)
Fortunately, Ah Keeps Mah Feathers Numbered For Just Such An Emergency
Play: After taking damage or a bad condition (slow, level loss, ability damage, etc.)
Effect: Remember a one-shot restorative you put away for a rainy day.
Leopold!
Play: Anytime
Effect: +10 on Bluff/Disguise checks on imitating someone famous from out of town
Of Course, You Realize This Means War
Play: You have just suffered a humiliating defeat of some type
Effect: For the duration of your next encounter, your character is +2 on all rolls against that opponent, they are -2 on all rolls against you.
The Eleudium Q-38 Explosive Space Modulator! It's Gone!
Play: Whenever somebody pulls out something new.
Effect: If you had the opportunity and the skill, make a retroactive pickpocket roll to see if you have it. Else, they must search 1d4 founds to find where they put it.