Ambilevous Example.

"You've got two left hands, and can't cast spells properly."

This trait causes question marks to be constantly floating up from your character's head, and any directional spells you attempt will go the opposite (horizontal) direction that they normally would.

Spoilers below

Having two left hands is not a bad trait to have while fighting Johannes in his first form, as he chases you down and leaves little room for you to turn around and cast a spell.