Watch Conan O'Brien Jump Offstage as James Franco Recalls Filming a Porno

James Franco has starred in many film genres, and on last night's Conan he revealed that [expletive] is included on that list. But while explaining why, James went into a little too much detail for Conan O'Brien, who had to abandon set!

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James will soon be starring in, Cherry, a film about [expletive], and explained on Conan that he has had some experience in [expletive].

"When I was young — it's not like I went down to Van Nuys and tried to break into the [expletive] industry — I got a video camera, and my girlfriend and I decided to film ourselves," he explained while laughing. "And we watched it back and said, 'Yeah, let's never watch that again.' "

But then James went too far: In an attempt to explain why [expletive] is difficult work, he brought his grandma into the conversation!

To that, Conan could only jump offstage to make him stop.

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Watch the hilarious clip below!