Just as the Englishman's sitting down, a fly dive-bombs his pint and falls in. The Englishman, disgusted, pours the whole beer out, and orders another pint of Bass.
Seconds later, another fly ends up in the Irishman's pint. The Irishman plucks the fly out from the beer, throws it over his shoulder, and drinks the pint in one gulp.
Moments after this, a third fly falls into the Scotsman's pint. The Scotsman plucks out the fly, stares it right in the eye, and yells, "SPIT IT OOT, YE BASTID! SPIT IT OOT!!"
ROFL