Paul Reiser had a stand-up gig at the Bay Street Theater in Sag Harbor on July 20 but... as those who were there will recall -- he got a little help from a friend: Billy Joel. 

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Joel came on stage towards the end, played a couple songs, and Reiser had a nice, unexpected triumph. (And some subsequent press.)

On Tuesday's "Late Night with Seth Meyers," Reiser offers a little background into how this came about, and makes a pitch for a reunion concert with Joel. Unclear whether this pitch will be embraced.