The Last Man on Earth (1964)

This is a film adaptation of the novel I Am Legend.  Vincent Price plays a scientist who has become immune to the disease that has wiped out the entire human race...so he thinks.  This disease turns the humans into zombies who come out at night looking for food.  He has taken it upon himself to kill and dispose of them during the day, while he is still looking for living humans.  This story intrigued me, but I had to fast forward it to the end just to find out how it ended...boring.  He found some other humans, but could not convince them that he was not a zombie and ended up being killed.  I realize that I just gave you the ending, but trust me, you will want to skip this one.