Fascinating piece on horror and psychology -- the evolutionary reasons why we're drawn to horror.
"..captive monkeys that, despite their fear of snakes, kept lifting the lid of a box containing the reptiles to peek inside.. a monkey would cautiously walk up to the bag, slowly open it, and peer down inside before shrieking and racing away. After seeing one monkey do this, another monkey would carefully walk over to the bag to take a peek, then scream and run. Then another would do the same thing, then another.
...Morbid fascination with danger is widespread in the animal kingdom—it's called predator inspection."