Yeah, I'm huge on this show during summer reruns.
So what's your favourite/creepiest Unsolved Mysteries (that you remember)?
I can't think of too many right now, but The Hum (a society of 1000+ people world-wide who can hear this awful low-pitched hum) is a recent favourite.
Also, I'd have to nominate the story about a mean-spirited abusive father who collapsed in a French bank and thought he was going to die. Then, he claims while he was unconsious and dying he was taken to the depths of Hell and beaten (well, his spirit was). After praying for the first time in his life, he was "saved" by a holy ghost who took him away from the beatings, and he eventually woke up (in human form) and recovered. Now he's a reverend. Crazy.
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