Back in my college days I took a marketing class. Our assignment was to develop a product and a plan how to market it. Well, my product was Lump-O-Coal. It would've been a lump of coal in a plastic wrapper with a card that could be hung on a peg in stores. The front would read Lump-O-Coal For that rotten little kid. The back of the card would have a short tale about the supposed legend of Santa Claus leaving a lump of coal in the stockings of bad children who weren't particularly good--a practice somewhat forgotten in modern times.
Well, I note a few places online have come up with similar products. You really can get that horrible nephew a lump of coal for Christmas. Yay! Since I couldn't develop the product I am glad others have.