Didja hear about the dirty trick played on CraigsList? Someone
advertised free stuff in their backyard, just go in and take it. The
thing was, it wasn't the poster's address, but someone he wanted to burn.
The homeowner finally noticed stuff disappearing: lawnmower, barbecue,
patio furniture, etc and called 911.
Craig hisself launched an investigation into it with a reward for info
on the perp.

I remember reading in the paper about someone who had a beef the owner
of a Christmas tree lot.

Late one night, the lock/chain securing the lot was cut, gate opened,
and a nice big sign erected reading 'Free Christmas Trees Take one,
Merry Christmas! or some such...

Erik