It's not paranoia if they're really after you. Let's see:

1.) Final scene from Blink, season 3 of current Doctor Who. You know, the one with all those statues. I should add that it doesn't work that way anymore after all the subsequent overexposure of the Angels, but back then? I never felt the same way around statues of any kind again. :)

2.) The panel of a cat dream in Dream of a thousand cats, in volume 3 of The Sandman. Anyone ever owning a cat, or rather, being owned by one, knows that Gaiman reveals the truth here. This is exactly what cats dream of. And if they do accomplish the change they wish, I fear I'll be one of the first to die in the cat revolution. My mother may be spared, being a superbly trained cat servant extraordinaire, but you know, when I'm back home in Bamberg and want to write and our cat wants to sit on the chair in front of the computer? I actually claim that chair and put her down to the floor. I'm DOOMED.

3.) Any number of Twin Peaks scenes featuring BOB, especially if he shows up only at the corner of one's eye, for a moment. But if I have to narrow it down, the final one. If BOB can be in ( spoiler ), there is no hope for the rest of us.

4.) Sweeney Todd, the song Have A Little Priest. I entirely blame Stephen Sondheim for suspecting that any given fast food enterprise, either in history or now, could be a means for serial killers to dispose of bodies. He accomplished this not just by adapting that Victorian potpoiler but for making the music of the ballad when Sweeney Todd and Mrs. Lovett first develop their fiendish scheme such a damm ear worm.

5.) The Silence of the Lambs, Clarice Starling enters what turns out to be the villain's lair, a fact she realises by a moth fluttering by. Now that movie has a great deal of scary scenes, plus I had read the novel it was based on before and actually knew what would happen. But the use of moths in it on screen somehow impacted me differently. Maybe because the night I first saw it, the summer night, I went home, took a shower, had the window open, a moth flew in while I was still in the shower... you better believe I screamed. I had no feelings about moths before. But after this film, I always get a little shudder when coming across one. Though the time in the shower was the only time I screamed. I blame you, Jonathan Demme.