watch the video here:
From Boing Boing:
You can open the door of a Mazda 3 with a tennis ball — just burn a small hole in the ball, line it up over the lock mechanism, then push it as hard as you can. The ball forces air into the locking mechanism, which causes it to spring open.
Update: This appears to be fake. Just when I was heading out the door with a bag full of tennis balls to… umm… “find” things in other people’s vehicles.
The Annotated Everything 
How do you figure a Mazda 3? That wasn’t a Mazda 3 in the video…or if it was it was a much older one.