[cartoon]

his duplicator

Correct!

He would make five Calvins to change the lightbulb while he stayed upstairs and read comic books: One to spend an hour arguing with his mom and threatening to sue over child labor law violations, one to play on his sled, one to build a snowman, one to dispute his dad's claim that changing lightbulbs builds character, and one to change it (with a duplicate of Hobbes to give him a boost).
Artwork © Watterson/UPS; click for notice.