#6
How many flies does it take to screw in a light bulb?
2 but nobody knows how they got in there.
#5
How many mice does it take to screw in a lightbulb?
Two but it’s cramped.
#4
How many Mystery-genre writers does it take to change a light bulb?
Answer: Two. One to screw it almost all the way in and the other to give it a surprising twist at the end.