I couldn't for the life of me figure out why it had failed to close properly around the whatchacallit, shackle? on the mooring buoy. The opening of the hook was clearly large enough to accommodate the shackle; you could see that by eyeballing it.
So I put it back on the pole and walked up to the bow and darted it at the mooring buoy -- while still safely attached, this time -- and eccolo:
(As usual, click to enlarge.)
Doin' what it oughter, right? So why didn't it do that when I needed it?!
With the profound superstition of sailors, I can only think it was a message from the gods: Take nothing for granted -- especially technology.