Answer:
The negative hero in each story
There is an ancient invention still used in some parts of the world today that allows people to see through walls. What is it?
You walk into a room with a match, a kerosene lamp and a fireplace. Which do you light first?
Some keep it in a dumpster while others keep it in their trunk.
What do you have in December that you don't have in any other month?
What is the middle of water but is not an island?