The term "thagomizer" was coined by Gary Larson in jest

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Heh. I did not know this. From Wikipedia.

The term "thagomizer" was coined by Gary Larson in jest, in a 1982 The Far Side comic in which a group of cavemen in a faux-modern lecture hall are taught by their caveman professor that the spikes on a stegosaur's tail are so named "after the late Thag Simmons".

The term was picked up initially by Ken Carpenter, a paleontologist at the Denver Museum of Nature and Science, who used the term when describing a fossil at the Society of Vertebrate Paleontology Annual Meeting in 1993. Thagomizer has since been adopted as an informal anatomical term,[10] and is used by the Smithsonian Institution, the Dinosaur National Monument, the book The Complete Dinosaur and the BBC documentary series Planet Dinosaur.

The cartoon fate of Thag Simmons notwithstanding, stegosaurs and humans did not exist in the same era; humans evolved around 60 million years after the event that killed all non-avian dinosaurs, and some 120 million years after stegosaurids went extinct. In The Prehistory of the Far Side, Gary Larson suggests that "there should be cartoon confessionals where we could go and say things like, 'Father, I have sinned – I have drawn dinosaurs and hominids together in the same cartoon.'"

Gary Larson - filling linguistic voids.