A couple come to mind, once in the 70's was hunting in the snow, spotted a buck and raised my gun, the old k4 weaver had fogged up to a point of zero chance to shoot. Last hunt with that scope. Another about 10 years ago opening morning in the rain, just getting light enough to glass, had my old 700 leaned against a small burned snag, with the bark gone, the wind was howling and the snag moved enough that the gun fell over, the bell of the Leupold landed on a rock, bending it down to where it was contacting the barrel. Bad way to start the season, and a stark reminder of where not to lean your gun.
Mike