The Weiners Circle in Chicago's Lincoln Park neighborhood is famous for four things: Chicago-style hotdogs, hamburgers, cheese fries and the flurry of late-night profanity and verbal abuse that passes between employees and customers. In the city for a week of shows, talk-show host Conan O'Brien decided to conduct an experiment, sending 30 Rock actor Jack McBrayer -- 'the nicest, most polite person we know" -- into the lion's den.

The result is hilariously predictable, as the grinning McBrayer wilts under the barrage of shrieking vulgarity and put-downs. "You're very rude," he says as he slinks away with his order. "I am going to leave. You have treated me very rude, and I'm coming back with a friend and you will be very sorry."

Not just any friend, mind you, but Robert Smigel's Triumph, the Insult Comic Dog. And that's when the segment turns hysterical.