One time at uni we were looking at news articles on this sort of thing. One guy who had killed someone wore all black, a long black coat and had a Matrix poster in his room, and the student who was looking at that article always wears black, a long black coat, and he confessed to having a Matrix poster in his room!
This thread gave me a laugh, though! It's usually rap music that carries not so subliminal messages about killing.
Guess now they've found a new influence.