This Might Just Work (Ex)

You're adept at combining optimistic resourcefulness with natural skill. You can attempt a skill check with a class skill in place of a skill that uses the same ability score modifier. For example, you could attempt an Acrobatics check in place of a Stealth check because both skills are based on Dexterity. You take a –5 penalty on this check and can't take 10 or 20 on it. The GM can disallow certain uses of this ability when the skill can't possibly be applied to the task.