I just watched a documentary about Tesla and his feud with Edison over whose power (DC vs. AC) would win out, and part of that battle involved light bulbs. Edison had a patent on the screw base, so Tesla made one with a different kind of seal for the World Fair. The bulb in the photo is a reproduction of one of Edison's early bulbs.
Taken with Sony Mavica FD-91. And yes I took this shot on 2/14/10 (with a Mavica - my dear old friend..)