Spinnaker Flying. Yes, I've done it on a boat with a 70' mast. We would tie a line between the tack and clew and put a block on that line. Then we'd tie a large fender to the block. That would be the seat. After you were up you could reach up to the clew-tack line and pull yourself from one end to the other which would get the chute oscillating back and forth. Combine that with the whip action from the chute filling then dumping and it was quite the ride.