'American Horror Story'
- Next gallery - New images from 'Da Vinci's Demons' season 2 include a Mona Lisa cameo
- Previous gallery - 10 most shocking moments of 'The Walking Dead' so far
10. "Unsolved Mysteries"
Years: 1987-2002 (original run)
Why it's scary: Robert Stack's chilling voiceover mixed with those eerie musical cues had the effect of making one think that whatever was happening on screen was liable to happen to you right at this very moment, regardless of how outlandish it sounded. I'm guessing I'm far from the only one who lost countless hours of sleep over this show as a kid.
Scariest moment: Too many to count, but anything involving alien abductions was bound to make the hairs on the back of my neck stand up.