Back in the 1970’s as I recall a couple of guys wanted to demonstrate the flak jacket to Houston Oiler quarterback Dan Pastorini....similar demonstration...I think they used a baseball bat (one wore while the other one swung)...Dan just watched.
They made the sale though.
In the late 80’s in Washington D.C. a couple gang bangers decided to test out their body armor. They got mad at each other after the initial exchange of gunfire and ended up shooting each other in places the armor didn’t cover.
That’s how they train the Spetsnaz..they shoot them so they won’t be in shock in real battle conditions once they get hit. There’s another video on Youtube where one guy was selling his variation of the BP vest and shoots himself with a magnum to show the buyers it’s safe..
I heard of a couple of guys testing a vest, but they used a knife, the vest wearer died.