The idiot who went to the restaurant - International joke

An Idiot was eating in a restaurant and suddenly, he started singing aloud to the pleasure of the other customers. After eating, he stood up to go without paying for his meal. "You haven't paid for your meal" said a waitress to him to which he replied "what do you make of my entertainment then?" Getting annoyed, the waitress replied, “no one asked you to entertain anyone," to which the Idiot replied "no one asked me to come and eat here either."