Headless Asylum
Headless Asylum is the name of one of Rodrick's heavy-metal discs. It only appears in Diary of a Wimpy Kid: Cabin Fever. The disc depicts a bloody knife and a splatter of blood on top, and has a parental warning label.
It was a few days until Christmas, and Susan told Greg not to open his presents early. However, Greg wanted to see his presents, so when his parents were not there, he sneaked down stairs, opened his present, and found it to be the video game that he wanted. Greg would play the video game while his parents were asleep, and eventually completed it before Christmas. Meanwhile, Greg realized that the box might feel light, so he put the CD into the box, since Rodrick's disc was heavier.
On Christmas day, as Greg was opening his presents, he realized that he forgot to remove the music CD. Susan mistakenly believed the Game Hut clerk sold it to Greg, so she went to the store to make a complaint.