You can exploit this trick to some extent to name a file in a way that spoofs its real extension. E.g. name an .exe file such that it looks like if it was .doc (and give the exe an icon associated often with .doc to be even more convincing).
You can do the same with sourcecode too.<p><pre><code> System.out.println("Do live"); // not doog
</code></pre>
Right-left-override is fun, but to see it really shine you have to combine it with some pop-directional-formatting.