Related Clues:

• Like ''The X-Files''
• Missing a few marbles
• Uncannily spooky
• Unsettlingly strange
• Kind of duck
• Like ''The Shining,'' e.g.
• Really spooky
• Like all primes but one
• Lacking a match
• Atypical
• Exotic
• Like most Serling stories
• Really out there
• Like Halloween sounds
• Quite unusual