"Amnesia Bonus" perhaps, or "Myopic Penalty" or some such.
New Rule: "Optical Illusion"
In the event that any player catches another experienced player in the act of failing to observe every rule, in it's entirety, either through amnesia or myopia, the observant player may take one card from the other player's hand at any time that player has cards. The observant player may disregard hand-limit rules until it is their turn, for that one card only.
What do you think?