I was banned from CC a few years back "forever". I was so incensed I used my hardly exceptional IT prowess and re-registered a few times just to irritate the hell out of the guy who bounced me. Slightly different handle each time so it was absolutely clear it was me.

The background was a moderator who oversaw two different 6* cruise lines forums. I subsequently discovered that he had a very close relationship with one line and did everything to foster an nudge along good feedback and deleted bad feedback. He fostered a clubby atmosphere on that forum. He did the reverse with the other forum. It was becoming very obvious. I didn't face it down but commented about the different "atmosphere" on each and the differing tone of moderation.. Several long-timers explained through PM's about the "special treatment" he was getting from his favoured line. The other line didn't play ball. It was then that the penny dropped. And it was then that I was bounced.

I have reregistered .... but I can't think of anything irritating enough to do .... it still wrankles.