Custom Menus with non-page top-level menu item?

First of all, I love the theme!

I like the ease of the custom menus and I’d like to set several pages as sub-menus, but without having to have a parent page. Is there a way to have a blank menu item that’s just a place holder for the dropdown menu? For instance, if I wanted to have a Random Generators menu item, under which I list a Random Pocket Litter Generator and a Random Daily Carry Generator, can I do that without having a page titled Random Generators?

Thanks!