A promise that catches itself if no one else does.

selfAwarePromise.js

var $q = require('q');

function catchIfNeeded(name) {
    var caught = false;
    var promise = $q.try(function() {
        throw new Error('Catch me!');
    }).catch(function(err) {
        // This function is executed on the next "tick" of the event loop
        if (caught) {
            throw err;
        } else {
            console.log((name || 'You') + ' didn\'t catch me... T_T');
        }
    });
    var _then  = promise.then;
    promise.catch = function(rejected) {
        if (rejected && typeof rejected === 'function') {
            caught = true;
            console.log((name || 'You') + ' caught me!');
        }
        _then.call(promise, void 0, rejected);
    }
    promise.then = function(fulfilled, rejected, progressed) {
        if (rejected && typeof rejected === 'function') {
            caught = true;
            console.log((name || 'You') + ' caught me!');
        }
        _then.call(promise, fulfilled, rejected, progressed);
    }
    return promise;
}

catchIfNeeded(1); // 1 didn't catch me... T_T
catchIfNeeded(2).catch(function(){}); // 2 caught me!
catchIfNeeded(3).then(function(){}); // 3 didn't catch me... T_T
catchIfNeeded(4).then(function(){}, function(){}); // 4 caught me!