Also know as the Scratchy Monster, a story talked about between children of a being that comes in the middle of the night and leaves little scratches on people. The story was made by kids as a way to explain why sometimes they would wake up with scratches they don't remember receiving.
Some kids say he comes when you have been bad but the more common believe is that the monster has no reason, he's simple not a nice guy.
Basically any time a kid goes to bed and wakes up with a scratch he or she didn't have when going to bed is labeled as a Scratching Monster attack.