It's from the movie Billy Madison. There was a family of bullies with the last name of O'Doyle, and everytime they picked on someone afterwards they would say "

It's from the movie Billy Madison. There was a family of bullies with the last name of O'Doyle, and everytime they picked on someone afterwards they would say "O'Doyle Rules". They eventually had an incident with a banana peel, but you'll have to watch the movie for that one ;)