When I lived in a residential neighborhood, I had a similar problem. One time, a friend was over shooting and he hit the seam between the bales. The arrow passed through, then hit a stump which cuased it to flip over a fence and land in the ground right next to the homeowner who was pruning his bushes!!![:@]

He wasn't happy.

After he called the police . . . I moved my target with MY own house as the backup. It had a hole in the siding when we sold it years later!