Rowling said she walked out of the fight, into a pub, and invented Quidditch. “I don’t really know what the connection is between the row and Quidditch except that Quidditch is quite a violent game and maybe in my deepest, darkest soul I would quite like to see him hit by a bludger.”
“Mundungus is always smelling of his pipe and various other unsavory things, so that’s why he’s called Mundungus,” Rowling explained.