Making the parent menu item non selectable

With nested menus, it seems logical that the top level menu item would not necessarily have a corresponding page. Is there a way to make it non-selectable? For example: I might want a menu item called “Classes” which has child menu items like “Math 101”, “English 101”. I don’t really have any content for the “Classes” page. Is this possible?

I guess I could default Classes to the first class page by creating two link items for Math 101, naming one “Classes”?