This is not an original poem, but ever since I did a poem based on Jingle Bells, I've had this ditty running through my head from childhood.

Jingle bells, shotgun shells
Santa Claus is dead.
Rudolph took a 45
And shot him in the head!
GI Joe, GI Joe
Tried to save his life,
But Barbie doll, Barbie doll,
Stabbed him with a knife.
Now, how unsavory is that??!!!