Still wanting to shoot through the barrel I switched to 3" cans of concrete. By now the barrel had so many holes in it that it was only half full of water. The can hit just below the water line. The pusher can can be seen moving off to the to the left and ahead of the concrete can. The concrete hits and exits the far side of the barrel. Again the barrel 'jumps' off the ground and rotated before landing on it's base. In this case it does not tip over. This makes me think that it is the water shock wave, against the bottom, that knocks the barrel off the ground. Pretty neat to see that kind of energy transfer. Video (193k MPG)