Let me let you in a little secret: you know how in the movies you see people jumping through a glass window or breaking a glass bottle on somebody's head? Well it turns out that those wusses in Hollywood don't use real glass!
(I also have a feeling that the blood isn't real too but I don't have any proof of that yet...)
This site explains how to make sugar glass that you too can smash on your loved ones (without going to jail afterwards).
If you decide to make your own sugar glass let me know how it comes out...(just don't try to eat it).
BTW: there are a few other useful resources on independent movie making over at stormforcepictures.com.