At this old forum I went to, every time someone wanted to ban themselves, there was only one way to go: The porn post. They'd max out the length of a post with links to porn sites, images, videos, whatever. They'd also include forum memes that had gotten annoying to the point of an insta-ban (ASCII of Mario riding Yoshi, long story), and they'd get around the language filter (FLICK in the thread title and the like). They were legendary, if a little stupid. But, hey, porn, that's always nice.