Mayor Michael Bloomberg let loose Saturday night with the cast of Broadway's "Hair" at this year's Inner Circle Dinner.
The mayor arrived at the annual charity event -- where the city's political reporters roast public officials -- in a cardboard van singing along to songs from the 1960's musical.
He played an aging hippie named "Berg" who was the social director of a tribe. When told he should create a multi-billion dollar news service, he said he had the munchies and enjoyed being in detention.
The finale included guests Snookie and The Situation from MTV's "Jersey Shore."
The event raises money for dozens of causes like the Coalition for the Homeless and the American Heart Association.