There's an episode from the Leviathan story where newly married Jeb Hawkes and Carolyn are entering a hotel room. Jeb enters first and switches on the light but is spooked to discover a quivering phantom in the room with him, so he switches off the light to escape it and then suggests to Carolyn that they leave.
In participating in the comments section of Danny Horn's Dark Shadows Every Day and seeing occasional comments here on Dark Shadows Wiki, I have found that this is almost universally one of the least favorite special effects among Dark Shadows fans; they tend to make fun of it, find it laughable, and think of it as cheap looking.
But I was three years old, watching during the original broadcast in 1970. For some reason, it really intrigued me and was one of the memories of the show I always kept with me, until I could finally view it again on DVD some 43 years later. In those days, like any three year old, I would wake in the night with strange, out of body "flying" dreams -- the equivalent of "the thing under the bed." To readjust, I'd have to go back to sleep with the light on.
But here in this Dark Shadows episode, it's exactly the opposite. Turning on the light does not help Jeb Hawkes get back to normal. In order to be free of the specter that haunts him, he has to switch off the light and be in the dark with it. At that young age, that scene just struck me in a certain way.
It also provided me with an additional childhood memory I otherwise wouldn't have had. Thanks to Dark Shadows, I know exactly where I was and what I was doing and thinking in the first half of the four o'clock hour of an afternoon that was four months and fourteen days before my fourth birthday.
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