St. Patrick's Day Parade

An Englishman, a Scotsman, and an Irishman walk into a pub. 

They all order pints of Guinness. 

Just as they're served three flies land - one in each of their pints. 

The Englishman pushes his beer away in disgust. 

The Scotsman fishes the fly out as if nothing happened. 

The Irishman grabs the fly, holds over his glass and shouts: 

"SPIT IT OUT YOU BASTARD, SPIT IT OUT!"