2 of 18
Joe Carroll (James Purefoy), The Following
Sure, The Following's Joe Carroll plucked out the eyes of 14 college co-eds before getting caught, but the thing that makes him really terrifying is his absolute charm. Yep, that's right: Even while in prison, the former literature professor managed to amass a cult-like following of devotees whose missions in life are to impress the man they admire so much with similarly grisly murders. Chilling!