In case you forgot all about Lena Dunham's HBO show Girls, what with all those books you're reading that binge watching of X-Files you're most likely filling you're time with, the show would like to remind you that they are, indeed, in production.
The clip shows Hannah biking around a campus (meaning that she probably up and left for University of Iowa) and suddenly falling over. Except that wasn't Lena Dunham falling over—it was a stunt double! Soon the production crew steps in and the real Lena Dunham rolls up to take her place for the next shot. META!