Invented by Mr. Goatwaffle.
At one point, the sofas in the staff room of Left Nostril Academy were lumpy and uncomfortable. Mr. Goatwaffle decided to take matters into his own hands. After weeks of experimenting, he finally came up with a fantastic foam that one simply injects into an old sofa, immediately making it very comfortable.
Mr. Goatwaffle is never one for throwing things away. He kept all the previous experimental editions of the foam, many of which did not work very well, or had very strange reactions when sprayed.