Great idea for a thread, Rob! Though I hope you have some way of honouring those who actually do manage to do something that lands in this topic!
Here are a few I dream of seeing (through my own eyes and preferably afterwards on film):
Boarder's Balance Tightrope (BB on taut ito)
Bird>Stilt>Bird (clockwise/anticlockwise motion, maintaining contact between tama and ken at all times)
Lunar Rover>Tap>Opposite spin Lunar Rover (and yes, tap with the tama)