A dinosaur is drawing horses and cavemen on the cave wall. Two cavemen look at him and talk.
Dinosaurs are not smart enough to do cave drawings.
Why is the dinosaur drawing cave paintings?
It will be worth even more when he's extinct.
scene: a cave description: A dinosaur is drawing horses and cavemen on the cave wall. Two cavemen look at him and talk. uncanny: Dinosaurs are not smart enough to do cave drawings. entities: Caveman, Dinosaur, Cave_painting. caption: It will be worth even more when he's extinct.
This joke takes the common trope of an artist's work rising in value after they die to an extreme: instead of the lizard's art rising in value when the lizard dies, it rises in value after the entire lizard species is extinct. Extinction also fits in with the trope of cave-people/ancient times/dinosaurs.