How bout this one?
We did it on knee boards back before wakeboarding was invented...
Rider behind boat. With good speed, driver does a long slowly arching turn to sling the rider out in the into the flats with lots of momentum. Then the driver does a power turn in the opposite direction and immediately throttles all the way back. So now the boat has suddenly done about a 270 in the reverse direction, but the rider is still being whipped in the original direction. The trick is to drive it right so the line stays tight. If you drive it right, and if the rope doesn't get hung up on anything (like passengers' necks), the rider will continue to whip a full 360 all the way around the boat, and by the time they come around back behind the boat, there is such a vortex back there that it will buck a person harder then any triple-up I've seen. We used to get 10' or more behind a Prostar 190 even before the days of weight and extended pylons. Don't recall if anybody ever rode out of one of these, maybe not.
Shaun, I know you know this one, right?
Disclaimer: kids, don't try this at home