So a guy walks into a bar and tells the bartender, "I bet you a free drink that I can fart any song!"
The bartender thought the guy was crazy, but it was slow and no one else was in the bar, so the bartender says, "What the hell? What do I have to lose? You're on!"
The guy smiles, steps onto the stage, and says, "Alright, give me a moment to prepare."
The guy then unbuckles his belt, pulls down his pants and then takes a big shit all over the stage!
The bartender then gets madder than a hornets nest and says, "You fucking idiot! What the hell are you doing? I'm gonna kick your ass!"
The guy then says, "Hey! Even Frank Sinatra has to clear his throat before he sings!"