Morbid or just an interesting subject area. Bit like Aircrash Investigations. I've always found documentaries on serial killers interesting. The FBI estimates there are more than 25 serial killers operating throughout the U.S. at any given time. There are plenty to choose - from old timers like John Christie (Rillington Place), John Haigh (acid bath murderer), good old Jack the Ripper, to more recent William H Macy (the clown), Ted Bundy, Dennis Nilsen, Hannibal Lector and Dexter. So which is your favourite? I'd have to go with Richard Kuklinski (The Iceman). Outwardly a family man living and ordinary life with his wife and kids in the suburbs. Undercover a hitman for the mob and a serial killer who would among other things, tie up his victims to be eaten alive by rats.