Fictional Movie Serial Killers

Aside from the boogeyman, what really haunts us in our nightmares? Those terrifyingly dangerous movie killers, with their extreme acts of violence that only someone as crazy as them could think of let alone act on. These guys are different from mass murderers, as they would kill individually, meticulously stalking a victim and murdering them in cold blood.

Which of these fictional serial killers in a film do you consider the most psychotic?

After voting, you may discuss the poll here.