Short Temper (3.5e Flaw)
From D&D Wiki
You get enraged easily, going berserk whenever you suffer damage.
Effect: Whenever you suffer damage, you become enraged. Whilst enraged, you take a -2 penalty to Armor Class and cannot make Intelligence, Wisdom or Charisma-based skill checks. You will stay in this enraged state for 1d4 rounds or until the thing that caused them damage is defeated.