Its like a honeypot for assholes.

Reminds me of my grandfather, these kids kept knocking his mailbox down with baseball bats. After the second time it was hit, he put up a new one filled with concrete. The very next morning there was half a wooden baseball bat on the ground and a dent in the mailbox. They never did it again.

Where are these snowmen situated?

To make it worse, if they set a boobytrap on purpose that's illegal ( in in the US) and the kids could be liable.

I don't agree with driving into snowmen, especially if they're not in the street.

Sometimes you can't avoid leaf piles tho. 

This was my thought, you don't need cinder blocks in the way. Ice is hard and heavy, that shits gonna fuck up pretty much anything but a bulldozer or tank.

You could just use water to make the surfaces hard ice and it might be enough to hurt a front bumper.