"The subject matter is more serious, but we're trying to make it just as funny ... It's kind of a demented 'Tuesdays With Morrie' -- that's how I look at it. [Laughs]" -- Judd Apatow

Nestled in the Hollywood Hills is Runyon Canyon, a haven of celebrity exercise fanatics and people desperate to get discovered while hiking with their dogs. And for a few particularly star-studded days last December, it was also a location for filming 'Funny People,' Judd Apatow's latest flick.

Starring Adam Sandler as a mega-famous comedian -- if you can imagine that -- named George Simmons, 'Funny People' takes an unusual path to the laughs, giving Simmons a terminal medical condition and, in turn, a new lease on life. Helping him in his rediscovery of life before fame is not-quite-as-famous-but-maybe-even-funnier Ira Wright, played by Seth Rogen.

Given a supporting cast of characters that can only be called Apatowian (read: completely random and amazing), Moviefone's exclusive visit to the set was nothing short of hilariously entertaining. Check out this behind-the-scenes video tour, which includes interviews with Apatow, Rogen, Jonah Hill and Jason Schwartzman, and keep reading below for more 'Funny People' scoop.