So this actually happened almost two weeks ago, and I've been too embarrassed to post about it. I was sizing the exterior case (not the heavy, expensive internals) of the window AC unit in the bedroom window, and in the process managed to drop it. The case has a nice bend on one side, which I'll have to fix before it's useable.
I spent some more time on the AC unit today and I know how to mount it to our window now. It'll require a couple of 2x4s and some paint.