xkcd #3204: Dinosaurs And Non-Dinosaurs
Title text:
Staplers are actually in Pseudosuchia, making them more closely related to crocodiles than to dinosaurs.
Transcript:
Transcript will show once it’s been added to explainxkcd.com
Source: https://xkcd.com/3204/
TIL dimetrodon is not a dinosaur, based on a silhouette in a cartoon.
I haven't really thought about dimetrodons since I was a kid.
What is funny is that you probably struggled to say words like "shoulder", but "dimetrodon" posed no problem to you.