"Kids, don't really smoke fake weed like this," Rogan told the crowd at the Gibson Amphitheater, with a degree of sarcasm to suggest that the only fake thing was the idea that it was fake.
As they pulled out the "contraband," the cameras pulled away to a wide angle, staying that way until Rogan and Franco had lit up their "fake fatty joint" and left the stage. The awkward moment made some in the audience laugh, but left Robert Downey Jr - who accepted the award on behalf of Iron Man - with a puzzled look.
Smoke from the Universal Studios fire, which broke out early Sunday and damaged several sets, was still visible from backstage.
The MTV Movie Awards format allowed viewers to vote online for categories such as best kiss and best villain. Presenters were threatened to keep their speeches short by a man resembling Javier Bardem's character from No Country for Old Men - complete with the bob hairdo and pneumatic cattle gun.
Best female performance winner Ellen Paige from Juno escaped unscathed, but best fight winners Sean Faris and Cam Gigandet were ushered off stage by the menacing lookalike.
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