I had this happen to me. One day I had my little poodle on one of those screw chains in the front yard. A big ole pit bull go loose and started eating Fluffy. I was in my living room and was in the midst of cleaning my AR (M4 set up, very sweet!), so I jammed in a mag and popped off 6 quick shots through my front window. The third shot or so hit the pit bull in the hip and he scurried away.
Unfortuately, one of the other rounds skipped off the road and nailed the neighbor's nine-year-old daughter as she road her bike. It was a neck shot and she dropped like a sack of potatoes. I never knew there was that much blood in a little kid. So anyway, I run outside (luckily keeping my M4) to check on the kid and the dad starts to come out.
As you can imaging, he's a little pissed. He starts screaming profanities at me and acting all crazy like. Next thing ya know, he charges me, apparently intending to do me some physical harm. So, you got it, I had to put a cap in his ass (actually a few). The mom got smart and kept her ass inside.
Anyway, make a long story short, it cost me a lot of attorneys fees to get out of this one. So take Wolfpack's advice and get some mace.
Right-to-Bear
P.S. Yes... of course this is fictional... a lame attempt at humor and to point out that any discharge of a weapon in a public place is not a good idea unless human life is in certain jepardy.