I was so obsessed with this movie and following cartoon series that I was actually convinced saying Beetlejuice three times would produce supernatural results around me. I distinctly remember some award ceremony at school where they were announcing winners to something (I can't remember atm) and me closing my eyes and saying Beetlejuice x3 then Lo and behold I get called to stage.
Actually, 20 years later, I'm still convinced it had something to do with it.