Joe PerryAerosmith guitarist Joe Perry, 59, doesn't know his own strength--or does he? While rocking out during the band's Toronto concert last night, 62-year-old Steven Tyler abruptly fell off the stage, and today, TMZ has obtained video footage of exactly how it happened: Perry gave his bandmate a hip bump, which sent Tyler flying headlong into the crowd. After bounding back onto the stage, the frontman reportedly exclaimed, "It ain't gonna happen again, baby."

The incident comes one year after the singer broke his shoulder falling from the stage during an Aerosmith concert in South Dakota (after which Tyler entered rehab to treat an addiction to painkillers).