After dying at the start of 1988's Beetlejuice, Adam and Barbara learn that newly deceased people must remain in their homes for 125 years before they are able to "move on" to the afterlife.

A Beetlejuice 2 theory suggests why Adam and Barbara moved on, hinting that time spent with Lydia fulfilled their duties in the afterlife. However, at some point between 1988 and 2001, ...