Really, Really, Magical Forum
It has taken me a long time and several attempts but here it is:
A totally not-hosted-by-me-forum-in-a-url: http://tinyurl.com/reallyreallymagicalforum
If you don't understand how it works, well, I can explain. But trust me, you are not downloading anything from any of my sites to make that forum work, except for a piece of JS used to paginate which it could just as well get from github or whatever.
The actual code is at http://github.com/ralsina/magicforum
Note that Chrome 32 blocks such attempts for various, invalid reasons. You need to hit Ctrl+L and Enter to get it to work.