Some of you may be wondering where the custom of setting an angel at the very top of a Christmas tree comes from. Well...
As I understand the story, one year Santa was very busy. The elves were disorganized, the reindeer were slacking off, Mrs. Claus had just burnt the cookies. Nothing seemed to be going right.
Up in Heaven, God looked down and noticed that Christmas was in serious danger of being late - they didn't even have the tree set up in the toy factory yet! So He sent one of His angels down to help.
There at the North Pole, one of the management elves had just finished telling Santa that they'd lost a whole ream of wish lists, and that Rudolph was violently ill from overeating, and that they were having trouble with the runners on the sled. The angel arrived right about then, and finds Santa talking with this elf beside their Christmas tree - which is still lying on the factory floor, waiting to be set up.
Well, the angel heads over there to help. Santa looks up at the angel's arrival (which is yet another unwelcome interruption) and the angel asks: "What should I do with this tree?"
The rest is history.