An Englishman, Irishman And Scotsman All Sit Down At A Bar And Order A Beer...

...then three flies happen along, each one landing in the mug of its respective owner. The Englishman is repulsed and orders another. The Irishman gives him a dirty look, obviously finding his fey behaviour offensive, and flicks the fly from his mug, taking a long drink. Then both of them hear screaming. It's the Scotsman. They turn on their stools to find him holding the fly by the wings and hollering: "Cough it up, ya greedy bassa!!"