Zero. Homeless people don't screw in light bulbs they screw in cardboard boxes.
Five. It's a huge problem.
None, cuz in the end it doesn't even matter!!!
A: 10000 - to give the bulb a cultural revolution.
NONE! ITS A SECRET GOVERNMENT PLOT TO KEEP US IN THE DARK!"
A cardboard box isn't always empty on the inside. :(
Because they crack themselves up!