Stegosaurus is world-famous for its lime-sized brain and the quartet of nasty-looking spikes on its tail. A 1982 "Far Side" strip decided to have a little fun with the latter attribute. In that cartoon, we find an early human anachronistically lecturing his fellow cavemen about dinosaur-related hazards. Pointing at the rear end of a Stegosaurus diagram, he says “Now this end is called the thagomizer … after the late Thag Simmons.” Without meaning to, Larson’s strip plugged a gap in the scientific lexicon. Previously, nobody had ever given a name to the unique arrangement of tail spikes found on Stegosaurus and its relatives. But today, many paleontologists use the word “thagomizer” when describing this apparatus, even in scientific journals.Read more wonderful stories about The Far Side at mental_floss.