I like the idea; it is funny. But I feel this lacked a lot of actual animation, so I don't really wanna rate it too high based on that fact. Also a recommendation I have is when the reindeer poops on santa's head, nothing moves, but the reindeer still move their legs. You could still animate them moving (technically) by making a moving background; since technically if they were moving their legs forward on the sleigh they would be moving forward in midair.
Sorry if I made that sound confusing. Still though, nice little animation. Happy holidays!