If you've ever wondered what separates New York's toughest accent (The Bronx) from its second-toughest (The Rockaways), how East Villagers talk differently from their counterparts on the West, or why Long Islanders sound so flabbergasted all the time, allow Fred Armisen and his considerable improv skills to demonstrate.

The Portlandia star took the stage at a Doctors Without Borders charity event at Irving Plaza last week, taking requests from the crowd and transforming himself from a grizzled Brooklynite to a contemplative Upper West Sider and back again at the drop of a hat. Fortunately for him and for us, the only request Armisen ignores comes from the doofy guy who won't stop yelling "Chinatown."

[h/t ANIMAL, BoingBoing]