A video uploaded to YouTube earlier this week purportedly shows what happens when a Russian RPG-7 (rocket-propelled grenade) is fired at 45 sheets of bulletproof glass, measuring about 16 inches thick.
An RPG is a portable, shoulder-fired, anti-tank weapon system that fires rockets equipped with an explosive warhead.
Here's a side shot of an RPG:
Here's the target: 45 layers of bulletproof glass:
Here we go:
Here's the RPG on its way toward the bulletproof glass: