Crazy Vampires?
Vampires are said to have personality defects that most of us regular mortals would consider odd or even crazy. Vampires are known to have Obsessive-Compulsive Disorder (OCD). OCD is a neurobiological disorder where the affected have recurrent, intrusive thoughts, impulses, and obsessions of repetitive behaviors and mental acts.
Common symptoms of vampire OCD include bizarre checking and counting rituals. For example, a traditional method of escaping from a vampire was to throw down a handful of seeds. The vampire is powerless against its obsession to stop, pick up and count every single seed that was thrown down before doing anything else. An ancient method of stopping a vampire involved filling up its coffin with seeds. The vampire would never be able to escape from it's own impulses of check and counting the seeds.
Vampires also have a repetitive nature of untying every single knot that they come across. If you were to tie one thousand knots on one thousand strings a vampire would have to stop and untie all one thousand knots. It's sounds crazy to many people, but OCD is a real disorder that affects millions of people and vampires all over the world.