FullMag on YouTube has come out with one of their coolest videos to date. They start the video by shooting a 9mm round at bulletproof glass, then take out the 50. Cal.
This video shows a small piece of bulletproof glass that will be much more likely to stop a bullet than a large window of the same glass. The effects the bullet has on this glass are truly remarkable but not what I was expecting. You can see the video below.