Saw this on U.S. Army WTF moments on Facebook. The post says “The ultimate engineering test in Germany” The video clip is short. It shows a soldier pouring a beer and placing that beer on a special table mounted to the muzzle of the barrel. Then the tank is seen rolling at high speed and the barrel appears to be stabilized by the fact that it does not spill the beer.
Here is another strange test supposedly from the Netherlands. It is a Leopard tank braking behind a group of people. Considering their reaction, I think they did not know about this “test”. At least the tank barrel is pointed in a safe direction.