Bluebird async rejection

var Promise = require('bluebird');

var rejection = Promise.reject('boo');

asyncStuff().then(function() {
  rejection.catch(function(err) {
    console.log('meh');
  });
});

function asyncStuff() {
  return new Promise(function(resolve, reject) {
    setTimeout(resolve);
  });
}

// Possibly unhandled Error: boo
//    at Function.Promise.reject.Promise.rejected (./node_modules/bluebird/js/main/promise.js:274:21)
//    at Object.<anonymous> (./argh.js:3:25)