I went this route in high school at a dude i had classes with that kept insisting his dick was bigger than everyone’s. Eventually I’d ask how he knew, that we didn’t have gym class or do the same sports so he would’ve had to go out of his way to check or ask other people.

He would compulsively bring it up, only to get shut down when me or one of my friends started calling him the dick expert with a meticulous catalog of all the dude’s sizes.