This would be better if you could see it, but I will try anyhow.
Dude walks in the pub, nice pub, a guy playing keyboard, few couples around and so.The guy is slow, you know, below average inteligence. Far below. he orders a coke and goes to the toilet. Bartender, knowing him from before, decides to play a joke on him. The guy comes back and the bartender says:
Dude, while you were away, someone put a d*** in ypur coke. Seriously? Yeah! Well, who? I dont know, says the bartender, ask people around.
So the guy walks around and asks people, like, do you know who put his d*** in my coke? everybody says no and laughs at him. So, finaly, he comes to this guy playing keyboard. He asks him, dude, do you know who put his d*** in my coke? And the guy answers, of course! Strikes a f major and starts;
Who put his d*** in my coke... la-la-la... :D