JQuery :: How To Determine If Item Contains Child List

I have anunorderedlist with many list items several levels deep, some of which contain nested unordered lists. How can I determine whichindividuallist items contain nested lists and attach click events to only those list items? For example:

<ul><li>level 1
<ul><li>level 1-1</li>
<li>level 1-2
<ul><li>level 1-2-1</li>
<li>level 1-2-2</li>
<li>level 1-2-3</li>
<li>level 1-2-4</li>
<li>level 1-2-5</li>
</ul></li>
<li>level 1-3</li>
</ul></li></ul>

Level 1 and Level 1-2 should have the click event bound to them while all the other list items don't have anything bound to them. I assumed that I would loop over all the list items using each() and :has or .children(), but I couldn't figure out how to test if the list item I was iterating on contain a sublist.