In "School Spirits," protagonist Maddie (Peyton List) wakes up one day to discover she's a ghost - and, possibly even more disconcertingly, she's trapped in her high school forever. In the show, which premieres on Paramount+ on March 9, ghosts are everywhere, they can see everything, and unfortunately, they also can't leave the place where they died.

Despite playing a ghost on screen, List herself actually doesn't like to entertain the idea that ghosts might be walking among us. "I feel like the mind is so powerful. I prefer to say no," the 24-year-old star tells Popsugar. "I don't let any of that in, because I think the mind can just run and create a reality. I'm going to try to keep telling myself no . . . even though weird things keep happening to me and to people around me."

Her costar Sarah Yarkin - who plays fellow ghost Rhonda - also says...