Several years ago, a friend described to me a character build he had, which he called the "Quantum Barbarian."
His description of the final result was that (paraphrasing, as this was a number of years ago) whenever his Barbarian was raging, his character would stop raging. And yet, whenever his Barbarian was not raging, he would start raging. He never detailed the specifics of the build itself, though.
I was wondering whether such a build could or does actually exist? I am certain this was a D&D 3.5 build, as that was the system he and his gaming group played (IIRC 4e hadn't been released yet). A cursory search of Google for "quantum barbarian" and similar queries didn't turn up much, but it's possible the name was coined by my friend, and goes under another name by others.
There is, of course, the possibility that my friend was using some homebrew rules (feats, etc.), but if the build is possible I'd prefer to see it coming from official published sources. That said, if the build can function with homebrew rules that are widely available (such as http://dandwiki.com for example), that would also be aceptable.
It's also possible my friend and his GM misinterpreted some rule. If that's the case, I doubt it would be easy (or possible) to answer the question, but showcasing a common rule misinterpretation that could lead to such a build would also work.