Is this stiff as a board gone horribly wrong?

Very funny, obviously you're having a go at a previous question. Most of the time a good-natured ribbing makes a point better than a going for the throat argument. 

Like the classroom game stiff as a board, I doubt many would think it supernatural. A few are easily convinced, most (obviously, not all) would figure it out and have a laugh at themselves. 

This is a great illusion, but as they say in the Sherlock Holmes stories, it's always obvious when it's explained. Who are the audience members - people who just happened to be there or people who were coached? The "volunteers" are clearly assistants of the magician. Modern video techniques allow for all sorts of trickery.  

I think it must be. Did you see how Chris lifted the incredible weight of those human torsos using only his hands?  Now that part is obviously paranormal.