Of course we talk the talk now, but lol... what if something did really happen, and with pics to prove it? XD >.>
I remember in the news there was a kid from that vampire freaks website (aside from 4chan that place also seems like a hotbed for crime) who was talking about burning a church down, and some members jokingly went along with it. Then later on, he posted pics that he did prove them right, that he in fact did burn down the church (there was no one inside), and so the other users gave the pictures to police, and eventually he was arrested.
The other criminal story related to that site, was about I think a 13 year old girl, who hated her family, so much so, that she convinced her 21 year old boyfriend, whom she met on that site, to kill them (her mother, father and brother were all killed by him). Thus being able to escape somewhere else (this particular one happened in Canada).
There was also the latest Montreal shooting in a college, that the guy had posted pics of his guns and such before the event occurred...