How many tech support people does it take to change a light bulb? "We have an exact copy of the light bulb here and it seems to be working fine. Can you tell me what kind of electrical system you have? Okay, now exactly how dark is it? Okay, there could be four or five things wrong - have you tried the switch? - Is the bulb screwed in all the way? What kind of filament are you using? Is it properly attached? What voltage is your electrical system running at?" How many testers does it take to change a light bulb? “We just noticed that it was dark, we don't actually fix the problem.” How many developers does it take to change a light bulb? "The light bulb works fine on the electrical system in my office."