Two. 1 to screw it in, and 1 to complain that it's not dark enough.
One Brazillion.
It only takes two, but the trick is getting them in the lightbulb.
Count for yourself...
A: Three. One to screw it in one to watch and one to shoot the witness.
Were you bit ! What ! Do you not know what a hurricane is
100. 1 to change the light bulb and the other 99 to complain about how the old light bulb was much better.
Someone's mom is Snooki.
Seven - one to actually change the bulb and six to complain that they liked the old one better.