This has happened to me a couple of times, with different peeps every time. (Btw I'm a kid as well, and haven't done this before) The first time it happened, I was way too late and didn't see the culprit, and the second time I burst out the door with a knife(I was cooking when it happened) and chased the dude for a while to try to deter him. The third time it happened was just now. The culprit was running straight away from me, laughing and then I shot at him with my office supplies crossbow (http://www.wikihow.com/Make-a-Crossbow-Using-Pencils) and then was like "Who's laughing now?" when my shot hit home. This thing is quite powerful and accurate, and if it can put a hole in my wall, it will certainly hurt.