Applying arguments to objects. Works especially well if those objects are rabbits.

Rabbits.js

// define the function to see what the rabbits say
function speak (line) {
  console.log("The ", this.adjective, " rabbit says ", line);
}

// define some rabbit objects
var whiteRabbit = {adjective: "white", speak: speak};
var fatRabbit = {adjective: "fat", speak: speak};

// apply an array of arguments to our fatter of the two rabbit objects
speak.apply(fatRabbit, ["Yum."]);

// OUTPUT
The  fat  rabbit says  Yum.