Hydrapause

It can destroy paint and wood, or invite dreaded fungi into inaccessible places.  It can crumble concrete and asphalt, tumble down a mountainside and destroy anything in its path, or sink an enormous passenger ship.  In large quantities, especially when in motion -- it can send automobiles tumbling, or even erase entire coastal towns.  Heck, it can drown you.  But ya gotta admit, there are times when that dihydrogen monoxide stuff just hits the spot.