Head Shot

 
Prerequisite(s): Sneak Attack +6d6, Weapon Focus (Any Bludgeoning weapon)
 
Benefit: Your successful sneak attack with a bludgeoning weapon that you have weapon focus with, leaves your opponent Confused for 1 round. A successful Will save (DC = 10 + the number of extra damage dice normally dealt by your sneak attack + your Dex bonus) negates this effect. Using this feat reduces your sneak attack damage by 5d6. You must be able to reach your foes head to use this feat.
 
Source: Complete Scoundrel