One. We are efficient and don't like humour.
Nein.
A: 50: 3 to die trying, 1 to actually pull it off, and 46 other to say, "man, I could do that!"
Mein Karmph
In bite-sized pieces.
The purchaser.
How many pessimists does it take to change a light bulb? None - it's probably screwed it too tight anyhow!
One. Vegans have the same capability of changing a lightbulb as non-vegans.
An accountant without the sense of humour.
Only one of course, as we are highly efficient and have absolutely no sense of humour.