One. They're efficient and don't have humour.
Auschwitz
A Wurst-Kse Scenario
Madagascar
About 8000
Two. One to screw in the bulb and another to talk about how complicated it was.
FIND OUT NEXT TIME ON DRAGONBALL ZEEEEE! (I really hope this isn't a repost)
Germany.
Only one of course, as we are highly efficient and have absolutely no sense of humour.