Comedian Dan Nainan arrested after journalist punched in face over tweets

A Washington journalist was punched in the face late Wednesday, apparently over some wisecracks he made over Twitter -- which doesn't happen nearly as often as you might think in this town. The incident -- which witnesses said culminated in the arrest of stand-up comedian Dan Nainan -- occurred at the Improv, a Dupont Circle comedy club where Nainan was performing and writer Josh Rogin was in the audience.