How many pessimists does it take to change a light bulb? None - it's probably screwed it too tight anyhow!
All of them. One to hold the bulb and the rest to screw the world.
Only one; But it takes a WHOLE E.R. room to extract it afterwards. Double joke! "whole... hole." it's a play on words ;)
5,6,7,8.
pi
Just one but he has to coordinate ten other professionals who are doing this quiet complicated task.
One and not one.
One, although it's probably screwed in too tight anyway.
