Groundskeeper Willie:
Brothers and sisters are natural enemies. Like Englishmen and Scots! Or Welshmen and Scots! Or Japanese and Scots! Or Scots and other Scots! Damn Scots! They ruined Scotland!
https://www.youtube.com/watch?v=K5lYXaVkA0U
https://www.youtube.com/watch?v=K5lYXaVkA0U
The reason that is so funny is because it's so close to the truth! :)