Several elves were off sick, and their replacements did not produce the toys as fast so Santa was worried that he would not have enough toys that year.
Then Mrs. Claus told Santa that her Mother was coming to visit. This stressed Santa even more.
When he went to harness the reindeer, he found that three of them were about to give birth and two had jumped the fence and were out, heaven knows where.
Then when he began to load the sleigh one of the boards cracked and the toy bag fell to the ground and some toys broke. So, frustrated, Santa went into the house for a cup of coffee and a shot of whisky.
When he went to the cupboard, he discovered that the naughty elves had hidden the bottle. In his frustration, he accidentally dropped the coffee pot and it broke into hundreds of little pieces all over the kitchen floor. He went to get the broom and found that mice had eaten the straw it was made from.
Just then the doorbell rang and Santa cussed on his way to the door. He opened the door and there was a little angel with a great big Christmas tree. The angel said, very cheerfully, "Merry Christmas Santa. Isn't it just a lovely day? I have a beautiful tree for you. Isn't it just a lovely tree? Where would you like me to stick it?"
Thus began the tradition of the little angel on top of the Christmas tree.