Angular JS does not allow preventDefault or return false to work on form submission

I have a form I'd like to deliver via AJAX :

<form class="form-inline ng-pristine" ng-submit="sendForm()" method="post" action="/sign_up" accept-charset="UTF-8">

$scope.sendForm = (e) ->
  e.preventDefault ->
  console.log 'sendForm()'
  return false  

The console.log appears, and immediately it delivers the form.

It ignores both the e.preventDefault(), and the return false.

AngularJS reminds me of the honey badger. It just doesn't care.