Twice. A few years ago on the north fork I caught about a 12lb native hen with a knotted leader hanging from her mouth. My hook wasn't in her mouth, it was tangled in the leader. The other fish was a big native buck on the Sauk. He came floating down past me, barely breathing. He had a large hook in the back of his throat with the leader broken or cut at his mouth. I tried to help him out but the last thing I saw was him drifting down river.