Potatoe
I don't know, Vigo and see. (best read in Yanosh's voice)
Two. 1 to screw it in, and 1 to complain that it's not dark enough.
None. They aren't about to change a bulb when flipping a switch has worked for 15 years.
Seven one to change and the other six to sing about how good the old one was.
Dan Quayle wrote this joke.