If aliens came to Earth, how much explaining would it take for them to understand NORAD Tracks Santa?
"Well, you see, it's mainly there to help us eradicate human life on Earth, if the right people decide we need to. We haven't needed to so far, but we keep them around just in case. But as long as it's around, we warm the hearts of over 100 nations by helping Christian parents lie to their children once a year."