This is what I mean:

  doSomething(function (err) {
    doSomethingElse(function (err) {
      doYetAnotherThing(function (err) {
        throw new Error(
          "I don't bubble up to the top of the stack, " + 
          "because there is no stack!");
      });
    });
  });

BTW a great trick is to tick the little "Async" box in the Chrome Dev Tools, so you can get a full stacktrace showing exactly where you came from. It works for both callbacks and promises: http://www.html5rocks.com/en/tutorials/developertools/async-...