There is buzz that St. Louis Catholic School in Alexandria, Virginia held a mock conclave, where the boys who attend the school acted as the College of Cardinals and elected Sebastian I. (Click here for photos)
While this was supposed to be an educational event, the fact that children over the age of reason (7) are mocking such sacred ceremony is considered shameful.
Because of this, they male student body became Conclavists and elected their own pope. So, therefore, Sebastian I is an antipope because he is not the canonically-elected pope.
There have been fake conclaves over the past century, and click here for an article on modern-day antipopes.
Please pray that the real Conclave that begins Tuesday will not produce an Antipope.