An American, An English man, and an Irish man walk into a bar

They all order one beer, after a bit 3 flies come into the same bar and land on each of the men's drinks drinks the English man is disgusted and throws the beer on the floor, the American takes the fly out and continues to drink it, they Irish man drinks the beer with the fly in it when there is none left he squeezes the fly yelling

"GIVE ME BACK THAT LAST DROP YE BASTARD!"