It was shaping up to be an awful Christmas Eve for Santa. Mrs. Claus was sick, and he didn't want to leave her for the evening. The elves were going on strike. Three of the reindeer were pregnant, and Rudolph was being treated for a cracked hoof. He had no idea how he was going to get through the night...
There was a knock on the door. Santa opened it and saw a beautiful pine tree, covered in magical twinkling lights. An angel, holding a single candle, stood by it.
The angel looked up at Santa and said "Yo, Fat Man, where do you want me to stick this?"
...And that's how angels got on the top of the Christmas Tree.