Weirdest thing I have caught would probably be a bat while I was fishing some dry flies on a lake in the Rockies, but I also accedentaly snagged a old pink a few years back flyfishing for pinks and pikeminnow since i was bored oneday, but once I got it to the beach, it decided to give one more haul at freedom, but it was so rotten it ripped the tail section up to the adipose fin right off and it floated away missing 1/3 of its body leaving me with the other 1/3 on my fly... I hate pinks. Then other random things like 15foot tall full trees floating subsurface with root stems still all intact. Rocks, a stop sign, and far too many plastic election signs.