Catch Off-Guard

Combat

Foes are surprised by your skilled use of unorthodox and improvised weapons.

Benefit: You do not suffer any penalties for using an improvised melee weapon. Unarmed opponents are flat- footed against any attacks you make with an improvised melee weapon.

Normal: You take a –4 penalty on attack rolls made with an improvised weapon.

Source: Pathfinder Core Rulebook