BUT my favorite film/play about ghosts was also mentioned, but I will say it again just because it's so darn good: BLITHE SPIRIT!
Everyone keeps mentioning THE SECRET GARDEN because the musical added a lot of dead folk, but I remember no ghosts in any film or the original book. I'm not being pedantic, just clarifying things because I always thought THE SECRET GARDEN ripped off the ghosts from FOLLIES, the greatest musical ever written about ghosts!
I'm pissed because I cannot believe I forgot BLITHE SPIRIT, one of my alltime favorite plays and movies; I like the musical version, HIGH SPIRITS, as well.