Random Fact About Christmas #16 - Trick or Treat

You thought Trick or Treat was only for Halloween, but here in Spain they have their own way of doing it. I was told today that it is customary on Christmas Eve for children to come to your door and ring the doorbell.  They will then sing you a Christmas carol and you are to give them a treat or a 50 cent piece.  Hmm, wonder if they come to apartment doors?