what can one say in 12 minutes?

I've just found out that I will only have 12 minutes for my presentation next week. What the hell am I meant to say in 12 minutes? It doesn't help that I haven't done much by the way of preparation for this presentation - I have a mind map that outlines my ideas, but that's it at this point. Knowing that I will hardly have any time to explain anything meaningful or develop my argument is certainly putting a damper on my enthusiasm and inclination put my mind to this task...shame!