An Englishman, a Scotsman and an Irishman walk into a pub, and each order a pint of Guinness. By one of those tragic coincidences, three flies have also entered the pub, and each falls into one of the mugs and drowns.
The Englishman makes a disgusted face and orders a fresh pint.
The Scotsman fishes out the fly and drinks his beer.
The Irishman holds the fly above his mug, shakes it vigorously and finally shouts Spit it out, ya wee bastard, spit it out!