when did grandma got run over by a reindeer

Ah, that's a popular Christmas song. Let's see......it's a story about a grandmother who was hit by a reindeer on Christmas Eve, and her family has to spend the holiday trying to find her. The reindeer is later revealed to be Santa's lead reindeer, who was drunk and didn't realize what he had done. The family finds her in a ditch, and she's okay but very shaken up. The song is a humorous take on the Christmas season, and it's become a classic holiday tune.