It's some kind of new genre emerging and I really like these movies!

It's always about a camera crew following the wise serial killer showing them the way it's done... I thought these 3 were quite clever:

-How to be a Serial Killer (2008)
-Behind the Mask The Rise of Leslie Vernon (2006)
-C'est arrivé près de chez vous / Man Bites Dog (1992)

I've seen one more but can't remember the title...

Anyone who knows more movies like these please let me know cuz I love them!