I sometimes make random graphs in this figma file ⬇️ They usually mentally describe mental models or abstract concepts
My favorite graphs (not done by me):
The emotional guidance scale
The healing power of hugs
Trading partners (https://twitter.com/sundellviz/status/1488596964208001026)
Complexity created through informed simplicity
Midwit meme / IQ Bell curve
S&P500 returns
Political compass according to position in political compass
The history of the world graph