Almost anything you have ever seen that has gone viral on the internet, originated there.
Some is very funny, some is extremely dark and disturbing, and any and everything else in between. No rules. You want to tell a kid to kill himself? Go for it, then watch the news report about it the next day.
Have you ever seen the other 2 horrible matrix movies? The matrix is like the internet... and /b/ is the architect. AND the Oracle
And Neo!!!
EDIT
Link removed.. I'm pretty sure you already clicked it, and I'd rather not link anyone else there.