I'll throw a couple of instances. The first one is
@AnomynousDisorder420 - he creates some weak ass thread on some guy who is a Trump supporter and doesn't like LGBTBABAUPDOWNSTART+, which obviously looks like a PA call. It could end with people just shitting on him, but he took some of the screenshots the way you should never take them, so people quickly find out that he is a ponyfucker. He doesn't deny and uses the world "clop", which leads to people finding his nickname that of course he used fucking everywhere. The guy turns out to a caveman autist in his late 20's, who jerks off to, I shit you not, gorilla hypnosis mindcontrol.
The result is predictable.
Second one is somewhat different, since that user didn't get caught because of his weak cybersecurity skill, but still, he played a more than enough in his demise.
@CIA Nigger was a local moderator of Animal Control, but made a lethal mistake of trying to delete a thread about one of his furry friends just after said friend asked Null to delete it. After this he disappeared from the site completely and after some time someone posted his full dox, his face full of chromosome disorders and his love for fucking anthropomorphic planes. I'd argue that this reject got off rather easy, since he was the OP of Byuu's thread and you know how big of a pain in the ass it turned out to be in the end. Trannys and furfags should fuck with him instead.
Third one is user
@FedoraManManMan discovering his thread six months after signing into KF and making a fatal mistake of responding, which caused a crazy ride that is never going to end.