I've got a few.
A friend and I were duck hunting on a creek way back in the woods. We would normally go in and shoot wood ducks and mallards. I remember seeing wood ducks hit tree limbs on the way through the canopy. There were little pockets of water all around the creek with mature oaks lining those pockets. The ducks wanted in there bad enough to make a dive for those pockets every morning. It is something else to see a flight of woodies ducking and weaving through treetops. Anyway, this day, we are set up between the creek and a pocket. I remember looking up and seeing a drake woodie paddling up the creek. He was hugging the far bank and making good speed. Apparently, he crossed right in front of an otter, and the otter must have been hungry. All I remember seeing was a crazy splash, bloody water, and a few feathers. It happened about 10 yards from where we were.
I've seen Bald eagles come falling out of the heavens to try to intercept a duck in flight. We found out pretty quick that you can forget duck hunting if there is an eagle circling nearby.