I like the one where you shoot a duck and win an iPod, depending on the phases of the moon.
But if you mean a REAL Flash GAME, then I'd have to say...whatever that game was where you're this stick figure and you have to kill all these aliens on a Mars base. It's not from albinoblacksheep.com.
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"How are you gentlemen !! All your base are belong to us !! You are on the way to destruction. You have no chance to survive make your time. HA HA HA HA ...."
-Cats, Zero Wing (Genesis)