tonight's question of the ages

Let's say that there in front of you is bullet-proof glass. If you put the muzzle of a gun (regular 1911, nothing too fancy) smack up against the glass and fire... where does the bullet go? I mean, if the hollywood assumption is that bullet-proof is truly bullet-proof at least for the first nine rounds, then the first 9 rounds have gotta go somewhere, if they're not going through the glass... amirite?