This is my favorite routine with the Haunted Box.
Imagine spectator writing the name of someone
they hated as a child on one of the cards, and then writing the names of people they liked on the
other cards. He then mixes the cards, and then one by one deposits the cards in the box. Your back
can be turned the entire time. The box's lid slams shut on the card with the name of the hated
person.
I like to explain that the box responds negatively to negative emotion.