You can't tell it's in the dark
Cancer got Jobs.
They're still afraid of hangars.
None. They wait for the electrician to make a mistake and yell at them for doing it wrong.
None. They can't climb the ladder.
They have a sixth sense of humor
Pupil : Well you told me never to walk into school ten minutes late !
How many pessimists does it take to change a light bulb? None - it's probably screwed it too tight anyhow!
0, the light bulb has to want to change itself.
None. They just sit in the dark and blame the Jews.
You turn on the lights and shoot the black guy stealing it.