Let's go fishing
The mathematician says "2" The Physicist says "2, plus or minus 0.1" The engineer says "Probably around 2, but let's say 3 to be on the safe side".
You don't let her out.
None, the room is already lit.
How many did it take last year
Two! But don't ask me how they got inside there.
None, they'll just shoot the room for being black.
Atoll.
The Sel-Fish