I need a plan, 4chan

Today, there were some people that really pissed me off.  These contractor bastards cut down the majority of this tree that stands in my yard, which basically protects my (shitty, ugly, dirty) house from the gaping and glares of the people across the ditch (which is part of a community park where rich snobby assholes reside).  They even admitted themselves that they could not do this without permisson.

Now, I need a plan.  What can I do to fuck up their little project (which is dredging the ditch to make it deeper or some superfluous shit)?  I am under 18 though so I can't buy things that explode.

OK, not all caps.  That's much easier on the eyes and is a pleasure to read, thanks.