[twitter-bootstrap] Bootstrap tooltips not working

I'm going mad here.

I've got the following HTML:

<a href="#" rel="tooltip" title="A nice tooltip">test</a>

And the Bootstrap style tooltip refuses to display, just a normal tooltip.

I've got bootstrap.css working just fine, and I can see the classes in there

I've got all of the relevant JS files at the end of my HTML file:

<script src="bootstrap/js/jquery.js"></script>
<script src="bootstrap/js/bootstrap-alert.js"></script>
<script src="bootstrap/js/bootstrap-modal.js"></script>
<script src="bootstrap/js/bootstrap-transition.js"></script>
<script src="bootstrap/js/bootstrap-tooltip.js"></script>

I've looked at the source of Bootstrap's example and cannot see anything that initiates the tooltip anywhere in there. So I'm guessing it should just work, or am I missing something vital here?

I've got modals and alerts and other things working just fine, so I'm not a total moron ;)

Thanks for any help!