I heard there is this ancient CD that reveals a horrific satanic message when played backwards, but when you play it normally...It installs WINDOWS!!
There was this one site I found the day before Halloween (No joke) that had many urban legends which had extreme fear built into them. Here are some I remember...
Bloody Mary, nuff said.
A few times there've been stories at night about a teen going home alone in their car when another car comes up behind her and starts blinking his lights, the teen tries to lose the follower but he follows all the way home, continuously flashing their headlights. When she got home she ran to her mom and cried out "Someone's following me in their car!" the guy jumped out of his car and said, "I saw someone sneak into your car when you weren't looking, he tried to kill you a few times and I flashed my headlights so he could get seen."
Everyone knows the movie, Wizard of Oz, which was one of the first color movies ever. However the kid friendly aspect was only what looked like was there. During filming after the Wicked Witch confronted Dorothy at the old house, they started singing on, when the scarecrow falls over, there is a munchkin actor who hung himself in the background. They say that it was later edited to look like a bird spreading wings.
I'd link the site, but I'd need to look for it and it's 1 AM here, which is NOT a good idea looking up spooky legends and rumors.