We also did a really stupid thing on this transit. Furling the jib is really difficult in high winds, even when facing into it, so sometimes we roll it in wrong. Rolling it wrong means that the wind can catch in it.
The result is the top part of the sail fills with air and balloons out while the bottom is still furled. The wind causes the pocket of air in the sail to flail violently which shakes the entire rig in a very scary way. The only way we found to fix this is to do a 360 turn.
We had to do this twice. After the first turn we could open the sail again to furl in, but then it furled wrong again... so we had to do another turn. Then the jib got rolled in well, it's a very harrowing thing to do when you're just off a marina dock. I was on the radio when the wind caught in the damn thing >_<...