"The Smiling Worms" sounds to me like a failed 1990's glam-rock band, or maybe the name of an eclectic porno shop (or the name of a movie about an eclectic porno shop. If it starred Monica Bellucci, I'd watch that). Apparently, Prosorhochmus Keferstein is the scientific name for a rare species of smiling worm. I can't find a picture, and it would cost me $226 to purchase the relevant research article from The Journal Of Natural History.
Why smiling worms at all? If the topic of composting were to come up, surely the worms would smile.