You can have say five scenes - scene1, scene2, scene3, scene4, scene5 of which you might want to load one randomly. So now, you can load a scene with something like:
var num = 1 + Math.floor(Math.random()*4);
this.controller.pushScene('scene' + num);
If you cannot have the scenes named in numerical order, you can always have an array containing all the scene names and selecting one on button click randomly.