The movie was based off a fake trailer that Seth & Jay made for youtube for funsies called 'Jay and Seth Versus The Apocalypse', that is basically them trapped in a room in their underwear at the end of days. But then apparently Seth was like, "Hey, that would be kind of funny. We could just make a whole movie on that shit. And get Franco to be in it." (Franco was the best riff because he played himself as this pretentious douchehole hipster). I read this interview with Seth that said about a month before shooting started, the studio got nervous and said they didn't think it would work with the guys all playing themselves. So Seth tells them, 'It's cool, we'll just shoot two versions and one will be where we aren't playing ourselves.' Only they didn't. And Seth was like, ‘This has to work!’ through the whole shoot because they had nothing else to take to the studio.
The trailer for This Is The End (possibly for Comic-Con?).
Presented by James Franco and Seth Rogen in a bunker. Naturally.
Seriously, I laughed so hard that I was flushed and overheated and exhausted by the time the movie was over. I had to come home and lay down in bed with the fan on me for like ten minutes just to recuperate. Hysterical, you guys.