you see him showing wpxi, channel 11 in pittsburgh rocks, bricks, stones. >> this was the first one threeyears ago. this came through the window next to the phone with a message. >> bob says that he guesses that the damages total something $7,000 in his car and his home. bob shares the house with a friend named john bukar. john even got hit by one of these rocks that came crashing through the window. so finally, bob said you know what, forget t i'm setting up a surveillance video. and in the surveillance video, we see the culprit. he turned this video into penn township police, and they were able to figure out that this person is, in fact, 21-year-old charles predanovich, charged with criminal mischief, loitering and prowling. and there are similar instances of vandalism in the area. >> we've been looking to find out who has been doing the recent vandalism in the area and they said the video did help a lot. >> they don't know if it's all charles, but they are investigating. >> do they think that this guy just targeted these people? >> bob says he doesn't recognize the guy's name, he doesn