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. See the video for more.
(Thanks, Michael!)
Update:
Erik sez, "Consensus on GT is this is almost certainly fake. The two GTers with access
to Mazads were unable to reproduce. Faking in on video is trival — have
someone hit a remote unlock button.
We're not condemning it outright yet — the weather's too fucking cold to
give a a full try right now — 17F/-8C in St. Louis, 2F/-17C in
Detroitm,-2F/-19C in Chicago, and we must note that squeezing a tennis ball
that's dropped to 5F isn't trivial, and a large number of GTer work for the
auto industry in some form.
This is unlike the Kryptonite ball-point pen hack, which all of us were able
to reproduce within a day."
Update 2:
Clint sez, "Just a note that the tennis ball trick does work on some cars, but they must have a vacuum door lock system. You can also break into these cars with a toilet plunger, which must look decidedly odd."
