Heard this story on the Men in Blazers pod, not sure if it's true. There was an elite U10 team from Westchester, New York (an affluent suburb of NYC) who traveled into the city to play a friendly against another youth team last summer. It was up to the home side to supply a ref so they trotted out this bald dude. Guy spent the game ref'ing, but also giving tips to players on both teams. Parents of the visiting team gave this guy hell, told him to piss off as they thought he was throwing the game.
Guy pulled a and walked away. It was Pep Guardiola.