In our hall it is easy to identify the recently "dealt with" - if they answered and stop answering they've had a private reproof. If they were running a microphone and are "not on zer list" they've had a private reproof. They were all over cart (non)witnessing and now they're not? = Private reproof.
The "best one" I knew of were the self-righteous finger pointing pioneer wife and the persistent porn problem elder husband who got caught by said wife! They were always on about "immodest clothing" worn by others. She went to pieces and came off of pioneering and he got removed from being an elder.
I had an un-christian feeling of grim satisfaction over that one.