I was fighting a large salmon (40 - 50 pounds) in Canada (Barkley Sound). It was staying near the surface and not diving very deep. I was standing on the port side of the boat, near the stern and the fish was running about as hard as it could out ahead of the bow. After about five minutes, a guy in a small boat hooked a sockeye behind us. He started his motor to maneuver his boat around to fight it better (he's probably 100 yds behind us). As soon as his motor started, my fish made a U turn and swam all the way back, right into his prop and it broke my line. I just felt sick. To this day, it was the largest salmon I've ever hooked.