An Englishman, an Irishman and a Scotsman went to a pub and each man ordered a Guinness. Just as the publican set the beer in front of each man, a swarm a flies buzzed by and a fly ended up struggling in the foam atop each man's beer.

The Englishman made a sour face and pushed his beer away in disgust for a replacement.

The Irishman picked up his brew and plucked the fly out and proceeded to drink his beer.

The Scottie fished the fly out of his beer and holding it over the foam shouted,

"SPIT IT BACK, YE BASTARD!!!!"