Walking Into Oblivion,,,, Vanishing

[guohua]

I do agree with @"Wallfire"  post, some people just have to sense of direction or their surrounding and they are easily frightened into a state of Panic.
Yes, some have gone as far as to try and get that 15 minutes of Fame as a missing person so they can get the attention they require to cope with life.

BUT!

I also believe some are genuinely just Gone as @"Mystic Wanderer"  suggest.
Not many, but some have to have just stepped into another dimension or abducted.