This is soooo cool. If you are going to do this, make sure that you don't injure yourself with flying shards of glass, and leave dangerous glass dust where it can be breathed in some time in the next couple of centuries.
This first video is from CMOG (Corning Museum of Glass) and really shows how they are made and how strong the bulb end is.
This video is also from CMOG - but really illustrates just how amazingly it blows up. Breaking the tail results in a shock wave of cracks that propagate towards the head of the drop at the astonishing spead of 5.5 Mach, or about 4,200 mph.
Isn't glass just the coolest stuff ever?