Foam block

Last night around 2 am there was a really strange noise outside, very violent and metal-y. I looked through the window and right on the corner of our street, there were two teens destroying some foam foundation material from the housing-estate-under-construction nearby using Y-shaped metal stakes. There was styrofoam everywhere and it looked like fresh snow. The teens chose to do this right in the middle of the road (which I imagine would've been a very confusing sight for the average motorist) so eventually the council sent a truck to remedy the situation, but they didn't do a great job and now there's little pieces of foam in trees, puddles, plants, etc. all the way down the street. I am only mentioning it because you don't see this kind of thing every day.