One, but it takes 7 years.
Two, one to change the lightbulb, and the other to bask in the light of the old one.
None. They'll sit in the dark and blame the Jews
Only one, but the light bulb should be willing to change.
5. 1 to screw in the light bulb, and 4 to remark on how grand the old one was.
Getting a lifetime of bad luck from breaking a condom.
