When I was a kid, we used to go out to Cross Lake in N. Alberta every May Long weekend to do some pike fishing. Lake used to be so clear you could see the Pike swimming around the piers of the boat dock.
The Lake was quickly over fished, and one year when we came back, the boat dock was easily half the length it used to be and the water was dirty as all get out. Chucking a spoon off the dock, I managed to hook and land, the windshield from a boat. Still the weirdest thing that I've ever caught on a fishing line.