Edit in JSFiddle

//extend the B object with Backbone.Events methods
var B = _.extend({}, Backbone.Events);

B.on('logFoo',function () {
    console.log('foo');
});

B.on('logBar',function () {
    console.log('bar');
});

B.trigger('logFoo logBar'); //logs foo then bar
B.off(); //remove all events on B
B.trigger('logFoo logBar'); //logs nothing, all events on B have been removed