Kilian Valkhof: Annoying.js
“As you can see, you can do some pretty bad things with JavaScript that will certainly drive your visitors away (or insane!). So why is this kind of functionality available? Some functions is actually very useful if you’re writing complex HTML5 web applications. By disabling text-selection on interface elements you can make the application easier to use, and you can re-implement the right click menu using your own options.”