Turns out it was a commercial:

The son of gay-hate church leader Fred Phelps has been attacked live on TV by an obese naked man who sat on him and shouted 'who's your daddy now?'

Westboro Baptist Church member David Phelps was being interviewed in a mobile studio when a 35-stone man, who was wearing no clothes, suddenly burst out of a loo to confront him.

It wasn't David Phelps, and the entire event was staged as a promo to get viewers for Battlecam.com's alleged plan to stream live footage of a man being crucified in Beverly Hills on Easter Sunday. Maybe it'll look like this: