Here's the scenario: You've locked your keys in the ignition of your Mazda3. Now there's an alternative to caving in the passenger's door to regain access to your car without wasting those precious cell minutes calling AAA. Apparently, all you need is a tennis ball (with a strategically placed hole burned into it) to get into your car. Check out the how-to video we've included after the jump that shows just what we mean. Now you just have to be sure you lock your keys in the car at either the sporting goods store or the country club.