A Englishman, a Scotsman, and Kelt walk into a pub

A Englishman, a Scotsman, and Kelt walk into a pub. They each buy a pint of Guiness beer.
Just as they were about to enjoy their creamy beverage three flies landed in each of their pints, and were stuck in the thick head.

The Englishman pushed his beer away from him in disgust.

The Scotsman fished the offending fly out of his beer and continued drinking it as if nothing had happened.

Kelt too, picked the fly out of his drink, held it out over the beer and then started yelling, "SPIT IT OUT, SPIT IT OUT, YOU BASTARD!!"