Well, I'm an adult now, and when mom reminded me of fruit upside down cake, I decided I would give it a try, but leave out the fruit. Following this recipe, I added some melted butter to a 9x13 cake pan, covered it in a bunch of brown sugar, and then poured a cake on top of it. I baked it, and flipped it over and out onto a cookie sheet. At this point I realized something was amiss, as the brown sugar wasn't as caramelized and stuck to the cake as I wanted. It's possible the fruit had a purpose that I didn't compensate for (maybe it adds liquid while baking).
So the top of the cake was a little crunchier than I expected, but it tasted pretty great. The nice thing about this cake is the topping replaces having to ice it. Easy.