A second story could be that a child woke up in the middle of Christmas night and saw a figure in red that wasn't Santa. The figure just stood at the end of the bed staring. The child was too frightened to move. When morning came, there was no sign of the figure. It was as if it had vanished into thin air.
Another might be a tale of a haunted Christmas ornament. A woman bought an old ornament at a thrift store. Every Christmas when she hung it on the tree, she would see a shadowy figure in the corner of her eye. Eventually, she got rid of the ornament and the figure disappeared. It seemed the ornament carried some sort of spooky spirit.
The contrast. Christmas is supposed to be a time of joy and celebration, so when there are scary elements associated with it, it's very different. It's like a disruption of the normal happy image we have of Christmas.
One true scary Christmas story is about a family who heard strange noises on Christmas Eve. They thought it was Santa at first. But then they saw a shadowy figure in the attic that didn't look like anything friendly. It turned out to be a vagrant who had broken in looking for a warm place. It was really terrifying for the family.
One scary true Christmas story is about a family who moved into an old house right before Christmas. Every Christmas Eve, they would hear strange noises coming from the attic. When they finally went up to check, they found an old diary that told of a tragic event that happened in the house many years ago on Christmas. It gave them the chills.
The contrast between the expected joy of Christmas and the horror. Christmas is supposed to be about happiness and family, so when something scary happens during this time, it's more jarring. For example, a dark presence in a house full of Christmas decorations.
A popular Christmas scary story is about a cursed Christmas ornament. When a family hangs it on their tree, strange things start to happen. Pictures on the wall start to tilt, and there are cold spots in the house. It seems that the ornament has a dark past and brings misfortune to those who display it during the holidays.
There's a story where on Christmas Eve, a child wakes up to see a figure in a Santa Claus suit outside their window, but the figure has a menacing look and red, glowing eyes. It's said to be an evil spirit that preys on the hopes and joys of Christmas. The child is terrified and can't get anyone to believe them. As the night progresses, they keep seeing the figure getting closer and closer to the house.