Within the MC forum - the first one appears to be a tradition for some families. Here are some other verses for other holidays.

Next Thanksgiving
Tune: Frère Jacques

Next Thanksgiving, next Thanksgiving,
Don't eat bread, don't eat bread,
Shove it up the turkey, shove it up the turkey,
Eat the bird, eat the bird.

Next Christmas, next Christmas,
Don't trim a tree, don't trim a tree,
Shove it up the chimney, shove it up the chimney,
Goose Saint Nick, goose Saint Nick.

Next Easter, next Easter,
Don't color eggs, don't color eggs,
Shove them up the rabbit, shove them up the rabbit,
Eat the hare, eat the hare