This was the movie that made zombie trend, but it never mentioned a word of zombie. Instead, it called them "ghouls" or "serial massacres".
The black-and-white movie was difficult to watch; sometimes I couldn't tell what was going on. Despite that, the acting was quite good. I got each character's personality and motivation.
This was more about human interaction and less about zombie attack. For example, one lady was completely in shock and couldn't help with anything. One man wanted to be the leader but couldn't make a good decision.
*SPOILER ALERT* everyone died at the end!