How trivial could a ghost's "unfinished business" be?

It is often said that ghosts linger on in the moral realm, because they have unfinished business or regrets from their now terminated life.
How many ghosts do you think decided to stick around, because they wanted to finish that TV show they were watching, or that movie that was about to be released?
I certainly could imagine myself becoming a ghost, so I could watch any movie or TV show for free, for all eternity, haunting the local cinema and unbeknowst to them, sit next to random people on their couch while they watch TV, and maybe knock over some plates for funsies and blame it on their cat.