Improvised Weapon

Sometimes objects not crafted to be weapons nonetheless see use in combat. Because such objects are not designed for this use, any creature that uses one in combat takes a -4 penalty on attack rolls made with that object. To determine the size category and appropriate damage for an improvised weapon, compare its relative size and damage potential to listed weapons to find a reasonable match.
An improvised weapon scores a threat on a natural roll of 20 and deals double damage on a Critical hit.
An improvised thrown weapon has a range increment of 10 feet. All improvised weapons are considered simple weapons. Throwing Items to Allies is also considered an improvised thrown weapon, but a Splash Weapon is not.