Jon Stewart sighting: 'Late Show with Stephen Colbert'

In retirement, Jon Stewart is turning up at the darnedest places.

Or at least one darn place. Case in point: The stage door at the Ed Sullivan Theater, where he helped friend and longtime colleague Stephen Colbert close out a bit on Thursday's "Late Show."

The video runs four minutes, and the main attraction doesn't appear until the end. The payoff does work, however.