There are 3 guys in a bar. an englishman, an irishman and a scotsman.
A fly lands in the englishmans beer.
He arrogantly turns the beer away.

A fly lands in the scotsman's beer. he flicks the fly away and drinks the beer.

Finally, we see the irishman, raging mad, holding the fly by the wings, shaking it, screaming "SPIT IT OUT YE DIRTY BASTARD!!!!"