Also, Episode 15. Lillan managing to get Leif near-gibbering with the urge to investigate what on earth could make that rock hover, before she just snatches it back saying "Secret". Shortly followed by a Crowning Moment of Funny when he tries with a hammer.
Crowning Music of Awesome - The entire soundtrack, though most of the tracks were just second-long creepy jingles, rather than full-blown BGM arrangements.
Cult Classic - The show is WORSHIPPED by those who watched it as kids/teens. In fact, it's not unusual at all to hear of adults in their young-to-late twenties gathering their friends and then marathon all the episodes in the same way some hardcore Star Wars fans would watch all the movies in one go.
Fridge Logic - Which second grader carries around a voltmeter in his backpack?! And lends it to a classmate on a whim?!
Narm Charm - The reason why the rare moments of narm (which consist mostly of occasional stilted acting from the kids and some lame wits) are easily forgiven.
Nightmare Fuel - Several, several little kids had their childhoods ruined when they were exposed to the Count's current form, as a talking skeleton.
Interestingly enough, there was a "Behind the scenes" featurette in which the computer designer explained that they purposely gave the Count weird-looking eyebrows and three front teeth in order to make him less intimidating. And truth to be told, he does indeed look pretty silly once you've grown up. But that didn't matter back in the days; the kids were still scared shitless.
The first PC game also qualifies, while nothing outright scary ever happens (except for that one time when the Count pops out of nowhere and seals you in a dungeon), it's full of spooky atmosphere and younger kids might find the game very unsettling.
Tough Act to Follow - Some fans are worrying if the sequel will be able to live up to its predecessor at all, especially considering the fact that more or less every plot thread in Greveholm was perfectly solved. Only time will tell how this turns out.