Some jagoff in a jeep parked right in front of of the grocery entrance so I rolled a couple of No Parking signs on metal poles with concrete bases across the lot and put one in front and one behind his vehicle, both right against the bumpers.
He saw the one in front but not the other, put it in reverse, knocked down and backed over the one behind. The loud crunching noises it made were most satisfying.
You devil you! LOL