Two more:
August 1979: A family of porcupines literally attacking the Kid Gore Shelter in central Vermont. They really wanted to come into the shelter and check out any salt left on the wooden seats by perspiring backpackers. We stayed up half the night successfully fending them off with lights and small rocks from the top bunks.
June 2007: In an attempt to lighten my load, I "hung" a food cache near the Fox Creek road crossing north of Damascus. Apparently I didn't do a very good job, because it wasn't there when I arrived from Atkins a day and a half later. I finally found evidence that something (raccoons?) had grabbed it and dragged it away under a dense thicket of bushes. All that was left was an extra pair of socks, a lollipop, and a gel packet! Fortunately, I was already about a day ahead of schedule and a NOBO thru-hiker donated me a dinner to get me to Damascus without starving.