Lazy scriptwriting where the odds are artificially stacked against the protagonists, which manifests as ridiculously bad luck, weird passivity on their part, random obstacles to their success appearing for no reason, and antagonists who seem to have a supernatural awareness of the situation.
Spoilers for Texas Chainsaw Massacre, Eden Lake and Funny Games.
Exemplified by that scene in many horror movies where the character escapes the villains and runs away and they run to another house or get picked up by a car on the highway, but it turns out that the house is owned by, or the car is driven by, an associate of the villains, or even the villains themselves. This isn't to say that this trope can't be done well - the bit in the original Texas Chainsaw Massacre when the girl escapes to the gas station feels fresh and is logical, but since then it's been repeatedly done in a really lazy way where the inevitability and predictability of it all just becomes frustrating - witness the end of Eden Lake when the woman drives away to the town but just happens to crash her car into the house owned by the parents of the main villain, and since there were multiple villains, the main villain's parents just happen to be holding a BBQ party at the time to which they've invited all the parents of the other villains; or the bit in Funny Games where the woman escapes and goes to a road and when she flags down a car it just happens to be the villains who have decided to drive away and drive back for no reason. In fact, I hate Funny Games because the whole point of that movie is to demonstrate all the lazy ways the script can stack the odds against the protagonists by doing them as blatantly as possible and then drawing attention to it.
There was a recently released movie I saw that actually used this trope twice in the last half hour. The girl escapes to a house, uh-oh, it's the house of one of the villains, she escapes, defeats the main villain, escapes to another house, which also turns out to be owned by a different villain. Talk about unlucky and not learning from mistakes.