I think finding it would be impossible at this point, but if we had notification history on (like the old forums had), I'd have been able to scroll through and find it for you.
All I can say is the user stated if a certain team beats a certain team (this was during the major), he's send a very rare-skinned gun to everyone who replied. Needless to say, what he predicted ultimately bit him in the arse and a thousand comments later, he was destroyed. The clincher was Jonathan E. himself stating he would ban the user for baiting everybody in the thread because he didn't meet his promise and was banned from the forum.
The user was "curryislove" and since then I haven't seen him on the forums. I apologise I cannot find the thread for you, a gold star for the user that managed to find it, if it hasn't been deleted.
In all honesty, the new forum is better than the old in so many ways, however I really miss the accessibility and functionality the old forum provided. The diversity in regards to player profiles and, of course, an outbox/notification history. When I get 9+ replies, I'm screwed because the pull-down will only show seven, so I'm screwed if one of the replies is from a post older than my current post history. That user will never get replied because I quite literally did not have the ability to see the message.
Otherwise, I apologise I cannot be of more help to you, friend. Have a good day.