The Boo Pillow is a pillow that is unobtainable in the store/pillows page in PFS. The only way to get it was to buy it during the Halloween Event 2017. The pillow design is of a Boo and Boos dragging a survivor for the particles.
After being put out of business from Lord Pumpkin Jr., they decided to work for themselves. Dragging survivors into lava is how they survive.
That was a year ago. One decided to train survivors for real life combat. Others told their history through this pillow.