One, although it's probably screwed in too tight anyway.
Two. One to hold the ladder and one to screw your mother - I mean light bulb!
to get to the other side
He liked to chop and change !
None. The piano player can do that with his left hand.
yishan
A: None They don't make Pampers small enough.
A: Deterrent.
How many pessimists does it take to change a light bulb? None - it's probably screwed it too tight anyhow!