In the episode Fly Shui Fungus adopts thousands of flies, believing and inviting them to be family.
Some of the flies that are mentioned are: Sasha, Lloyd, Rick, Perseus, Spencer and his children, who rest on Dilweed's bed and more specifically, on his pillow.
Fungus made them massage tables, a waterslide, a lounge, an exercise area and a hot tub.
It doesn't need to be said that Dilweed hates the idea of sharing a house with flies and does everything he can to dissuade Fungus about keeping them. In the end he finally persuades Fungus to release them with the help of a Woodchuck Morris drama movie.