If I were a big user of smileys, I'd be using the eyes-popping-out "WTF?" one at that last post. Is it brutally honest, sarcastic, or just a bit random? Seriously - no offence intended (and I do mean that), but I haven't a clue how to take that one.
For myself, I've not knowingly met a murderer face-to-face, although I knew a guy (well, he worked part-time at one of the shops on campus, so a lot of folk knew him a bit) at Uni who tried to burn down his house with his parents inside. That is, he succeeded as far as the house went, but not the parents. I remember his name, but I can't remember exactly how the court case went, so I won't splash it here in case he got off! PM me if you can really be arsed to know who I'm on about.
Other than that, I recently worked with a guy who was related to Ted Bundy, or so he claimed - and he didn't seem the kind to claim that sort of thing if it weren't true.
So, the answer to the question in the thread title is "none - I think!"