Silver Dagger Syndrome
The act of thoughtlessly subjecting Role-playing Game party members to damage (usually splash) while trying to solve puzzles, knock NPCs unconscious, and/or attacking an enemy that someone is in melee combat with.
DM: LOOK OUT! The Dagger Throwing Halfling is whipping daggers everywhere and has Just wounded the Elf!
PC #1: Damnit, he has Silver Dagger Syndrome again!
PC #1: Damnit, he has Silver Dagger Syndrome again!