A reference in the popular MMORPG game WOW where someone is tricked into clicking a portal to help summon a player when it turns out the player who is being summoned is the one who clicked it last.
I totally got roxxedl into thinking I was summoning another member of our party when it turned out I clicked the portal and summoned myself.
When your hero dies because of careless behavior and causes a downed barracks and some sometimes costs the game. (Works in any real time strategy game (DOTA, HON, and League of Legends...) where you have towers or barracks that the enemy can down.)