I lost mine on the Sky a couple of years ago. The river was way up and I dropped the anchor in some fast water that I really had no business anchoring in anyway. I knew I was in trouble when I felt that tell tale sudden deceleration as the anchor hit the bottom and immediately hung.

I tried yanking some, but every time I gave a good pull the rear of the boat would threaten to go under, so I decided a new anchor would less expensive than a new boat so I cut it loose.

I've gotten it hung several other times but have always gotten it back after a bit of work. One time I had to let all the slack out, tie the boat to the bank and then get out, hike upstream and yard on it from shore.

Its always a good way to work up a sweat and practice all the curse words in your vocabulary.