Ude gaeshi with the volume turned up
It's funny, because our concept and practice of the seventh technique from junana hon kata, or randori no kata (or "the 17"), ude gaeshi, has always been fairly light and easy. Uke basically does a backfall and sits down nicely.
There is, however, an alternative version that's a little more... thrilling.
You don't have to do it with a big air fall, but it's the basic turning action, rather than going straight back behind uke that intrigues me...