Potentially useless and harmful example of coercing a jQuery $.Deferred out of AngularJS' $q. See http://jsfiddle.net/boneskull/TX7fA/

gistfile1.js

var myApp = angular.module('myApp', []);

$(function () {
    var body = $('body'),
        injector = body.injector(),
        giveMeJQueryPromise = function ($log, $timeout) {
            var dfrd = $.Deferred();
            $log.log('deferring');
            $timeout(angular.noop, 2000).then(function () {
                dfrd.resolve('deferred');
            });
            return dfrd.promise();
        };
    jqpromise = injector.invoke(giveMeJQueryPromise);
    jqpromise.then(function (res) {
        console.log(res);
    });
});