Duplicate Paradox

The Duplicate Paradox is when a duplicate created by Calvin is seen by someone else rather than Calvin and Hobbes, and Calvin or Hobbes are present when the duplicate is seen by someone else.

Examples in The Calvin and Hobbes Show

 * In the Season 3 Episode "The Idiotapolis 499.9" after the finish, Calvin gets out and tosses his helmet at the driver who Calvin believed caused him to wreck (When Calvin really caused himself to wreck thanks to his driving) his parents (who are in the stands watching the race) are surprised to see a look-a-like of Calvin, but then the duplicate Calvin made who is with Calvin's parents states. "Oh crud, the paradox is happening", and vanishes in thin air, confusing Calvin's parents.
 * This also happens in a similar fashion in "Days of Calvin" and in "Formula C&H"
 * The paradox also happens in "The Real Calvin"