Night fishing for steelhead at drano a few years back. I was playing a particularly scrappy fish and he took off ripping across the surface right into the boat anchored next to us. Of course it was pitch black except for our small lantern. The other boat didn't have their light on. Anyway, the fish hit it full force with a LOUD thud against the aluminum. It knocked itself out, and scared the sh!t out of the guys in that boat. I cranked the fish in and it laid there not moving at all.