When someone (a troll) messes up your day by stopping you as your about to do something awesome. Like Gary Oak, from the original Pokemon Red & Blue games.

Pokemon = Real Life
1 pkmn, and it's health is red = you need to pee
half pokemon are poisoned = you need to vomit
half pokemon are lower leveled = you need to go NOW.

Gary Oak comes out as you're at the exit of the cave and challenges you to a battle.
=
That really annoying person who you dont like, but are nice to anyways, comes out as you're about to leave this totally boring place and guilt-trips you into staying.

Yeah, that guy just pulled the ol' Gary.
Has anyone got Pokemon Black and White yet?