How Furiously Do You Have To Masturbate To Actually Catch Fire?

I like looking at boobies and rubbing one out as much as the next guy, but a fellow in San Francisco took it to a whole new level.
Wednesday night an unidentified man was watching videos in a private booth at a porn store when he mysteriously became engulfed in flames.
Arson experts are not sure as to how the fire was ignited, but local police reportedly witnessed the man running out the front door on fire.
He is fighting for his life after suffering third-degree burns.