If you use `var self = this`, die.

dont-self-or-that.js

var Example = new Class({
    initialize: function() {
        // i now hate you if you do this in my codez
        var self = this; // or that.
    
        // 10 or 20 lines down, in another closure, I have to read up to 
        // make sure `self` is set the `this` that I want
        
        // instead, this is they way to go
        var example = this;

        // i know what `example` is, because we're in the Example class
        myEl.addEvent('click', function() {
            example.derp();
        });

    }
});