Well, here goes:

There was this Irishman sitting at the bar. Three drunken Englishmen were sitting behind him at a table, making jokes about him and laughing uproariously. One of them gets up and says, "Watch this, I'm going to pick a fight with that bastard." He walks over to the Irishman and says,"You know Saint Patrick was a faggot."

The Irishman looks at him and says, "Oh, really? I didn't know that." and goes back to his drink.

The Englishman goes back to his table and tells his buddies, "My God, this guy is unfazable, you can't piss him off."

One of his buddies gets up and says, "You just didn't do it right. Watch this." He goes up to the bar and says to the Irishman, "You know Saint Patrick was a cross dressing faggot."

The guy just looks at him and says, "Oh really? Huh, I didn't know that." and goes back to his drink.

The second Englishman walks back to the table in shock and says, "You're right, there is nothing that can piss this guy off."

The third Englishman gets up and says, "Time to let an experienced fellow to do the job. Watch this." He walks up to the bar and says to the Irishman, "You know, Saint Patrick was an Englishman."

The guy just looks at him and says, "Yeah, I know. That's what your buddies were telling me."