Wall of Shame: Wannabe Experts

It may be hazardous and stupid fun, but saddling up and wrapping around a figure 8 attached to the bridge and going for a ride MAY be fun?! Just belay once the ride is over. Sudden acceleration and smacking the trunk would be concerning.
You could do it so it's halfway safe. Put a pulley out on a limb, another pulley at the stem, and drop a big round to launch the rider. Haul the round back up to reset it.
Ten mill dynamic line should be enough. Something made by BlueWater comes to mind. Do they even make rope any more?
Ok, so I of course don't do crane work. Is taking a pick from a position that isn't above the tree ever a legitimate move?