Are you using strict mode? It doesn't fall back to the global object as `this` (except for setTimeout/setInterval, which are specified that way) - since I've st

Are you using strict mode? It doesn't fall back to the global object as `this` (except for setTimeout/setInterval, which are specified that way) - since I've started using it, I find out pretty quickly if I was missing a `.bind(this)` when passing a callback function.