One, but it takes 32 lightbulbs.
The answer may shock you.
OC It only takes 1. But another 999 to repost this 100% original joke. I made this.
How many pessimists does it take to change a light bulb? None - it's probably screwed it too tight anyhow!
One. They stick the bulb in the socket and wait for the world to revolve around them!
A full set of teeth
My zipper.
