FWIW,
VitaminH I'd like you to examine the next failed bulb, or if you have one that hasn't been whacked 12 ways for Topeka. Get hold of a jewelers file or a slim taper triangular file and take the time to score through the glass envelope, taking care not to end up with an emergency room visit.
If the filament is intact, together with the support wires, then failure is in the base, and I stand by my previous hypothesis. If the filament is broken, that would indicate physical shock-rather unlikely in a pendant fixture.
Since there are three of you, are you sure that your buddies haven't conspired to screw with your mind?
Hey Frank-put the burned out bulb back in after he's asleep-he just changed it yesterday.