I understand scissors cut paper… that is pretty much standard, and certainly the primary use of scissors. To a lesser extent, I even get paper covers rock; it’s a little unorthodox (and hardly a victory for paper, if you think about it), but nonetheless, not out of the question. The easiest leg of this little triumvirate to pull out, however, is this; what troglodyte breaks scissors with a rock (or [showing a minimal amount more intellect] tries to cut a rock with scissors)?