Not necessarily strange or weird but a rare sighting nonetheless. I once saw a bass eat a duckling at Shelby Forest in Tennessee. Mom was leading them in a line. Suddenly there was a huge boil in the water and one of the ducklings vanished.
A buddy of mine and I were fishing a creek WAY back in the sticks. This is the kind of place you hear banjos playing. There was an old man named Whited that lived nearby. We heard splashing around off in the distance and low and behold, Mr. Whited comes walking out of the lily pads with a rifle. My buddy asked him what he was doing. Mr. Whited said, "Deer hunting." This was the middle of summer. My friend asked what kind of rifle it was and he said a .22. I asked him if he was worried about getting in trouble with the Game Warden and he replied, "Ain't no Game Warden gonna mess with an old man out walking around in a swamp with a .22 deer hunting." Crazy old man.
The same friend and I were at the same creek fishing in his 2-man scamp. Suddenly we had a ricocheted bullet go right between our heads. Scared us both to death. We kinda laughed nervously and said it must have been Mr. Whited deer hunting again.
Once I was fishing a private 300 acre lake. I kept hearing something thrashing in the water on the other side of the cove. After a few times, I went across to see what it was. When I got over there it stopped completely. I went back across and started fishing again. The huge explosions started back again. I couldn't stand it. I had to see what it was. I went back across. This time it continued. It was a huge bass with a large bluegill stuck in its throat/mouth. I lipped the bass and forced the bluegill out, released both and they swam off.