The other day, a show in Australia called "Studio 10" had a guest who claims he can read people's minds by listening to their voice.

He did a stunt called "nail gun roulette," where he had a co-host named Sarah Harris randomly put four different nail guns on a of which was loaded.

He then asked her questions about each one while blindfolded, and started eliminating the ones he didn't think had nails in them.  

The first nail gun his co-host picked up was being held the wrong direction.  She almost shot herself in the face!  Yes, we know there's a safety on it that made that a little impossible, but the point is she clearly didn't pay attention.  

The incident happens around 4:20 if you wanna jump right to it.  It's a pretty cool video to watch though.