Specializing in groin protection, the Nutshellz company recently posted this video showing their CEO getting shot by a .22 LR on the protective cup.
Aside from being completely stupid and highly dangerous to demo, the cup does appear to work with a low energy, light bullet. Of course, the video is part of a Kickstarter campaign to raise money to produce this bit of gear.
Taking a look at the effect of a 9mm round (below), it appears there is significant backface deformation.
The .357 Magnum looks pretty painful as well:
What do you think? Does this have any merit as a piece of body armor, or should it be used only by ballplayers?
Thanks to Ports for the tip.