Recently watched Night of the Living Dead, and I was very impressed

"How could a low-budget, black and white movie from the 60s possibly scare be that scary." I thought to myself as I was purchasing my ticket for the movie. I was going to see the movie, because I had always heard that it was a good movie. I thought that this movie couldn't possibly be scary, so it had to have other merit to have it be considered a good movie.

I left the cinema that day quite spooked. I was amazed at with all of it. The true horror weren't the wondering ghouls, but the interaction between the people inside the house. It was a social experiment more than anything else. What would happen if six people were placed inside a house, with a wounded child, and impending doom closing in on them? This is the question answered by the movie. A power struggle between Ben and Harry, about the safest place in the house to hide, led to the death of Harry. Everybody sided with Ben, and in the end he only survived the longest because he hid in the cellar as Harry had suggested from the beginning.

TL;DR
I found the fighting between the survivors in the house to be very spooky.