Two: One to change it, and the other one to change it back again.
None. They have a machine that does that now.
Two! one to change the light bulb and the other to rotate the universe!
None! In Soviet Russia, light bulb changes you!
Four. One to change it and three to write the environmental-impact statement.
With the mechanic, there's a shot something might get fixed...
About 1 in every 500 or 600 million have a chance at becoming human.