Misunderstood rules -- add your own
The hand is part of the ball (from the NHFS rule book) so no matter how hard you hit someone's hand, if it's on the ball, it is not supposed to be a foul:
Rule 10-6, Art. 2: A player shall not contact an opponent with his/her hand unless such contact is only with the opponent's hand while it is on the ball and is incidental to an attempt to play the ball.
Other candidates for this category?