[deleted] I decided to visit said forum, my eyes now hate me for looking at such a forum, they look like their in need of a flarum migration and upgrade.
For a little while when I was younger I had a username that would cause MySQL to completely fail the query upon trying to load it. It was always fun to discover which websites did proper input sanitization and which ones didn't. I stopped doing that some time ago and switched to my current one after some time.