Christmas cards should be joyfull, fun, nostalgic, full of snow or anything related that would bring a smile on the receiver's face. However, I don't know what would a parent feel if they would receive a Christmas card like this one: Don't Forget The Fucking Cookies!
It's a Christmas card set created and sold in The Onion (R) store, and it should be targeted for people that "don't send holiday cards". In case the image on their store isn't clear enough, here's one closeup that they used to advertise via Google Adwords:
The advertisement image is just wrong, because it's a child in his bed with a gun pipe in his mouth. You can't see in the advertisement, but at the end of the gun is Santa. I'm not a parent but I still find this image quite disturbing, and even more disturbing is that this Christmas card set is on their bestseller list on the 11th position. I know that shocking things sell sometime, but for me this is just wrong, make fun of Santa, of Rudolf, the parent or anything else, but don't put a gun in a child's mouth.