- The Sinister Snowman. This special can genuinely scare kids.
- It's like if Clayface and Snow Miser had a child! And then it got taken over by the Thing.
- A more minor instance, but the elves in their frozen form on the Christmas glockenspiel are pretty creepy-looking.
http://tvtropes.org/pmwiki/pmwiki.php/NightmareFuel/ScoobyDooHauntedHolidays
FollowingNightmare Fuel / Scooby-Doo! Haunted Holidays
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