Most folk cannot organize a p*ss up in a brewery! Never minf do this for decades, not get seen, do it even onmoonless nights, do it over a large area with extreme precision.
So, wouldn't be surprised if it's some prank, initation right or such, of military/university/group of close, dedicated friends!
Haha! Love your posts, Silverblade. My thoughts exactly. But I couldn't put it as well as you.