Law of Brian

The law of Brain is quite simple, "Percussionists are dumb". This should be easy enough for you to understand, unless, of course, you have an intelligence level of 0.

History
While the law itself is quite simple, it is, in fact, the principle that allowed for the discovery of intelligence levels, and allowed Xqc13 and Farxodor to begin theorizing and researching about the topic. It is unknown how brian himself came across the law, or how it was proven at first, but it is undoubtably correct.