I guess it is "possible" for the sun to come up in the west in the morning.
Why dont you try it and let us know how it works out??
Well, I'd have to move somewhere I could legally have a grenade, and pay oodles of money for the grenade plus tax, plus find a source of kevlar, etc.
But maybe someone who knows the physics involved can clue me in on the expanded volume of the explosives in a typical grenade.