For several years now the Internet has been awash with viral videos about using a tennis ball to unlock your car door without a remote, key or other device. You just cut a hole in the tennis ball, squeeze it over the keyhole, release, and voila the car door is opened!
Sounds like an easy fix for tennis players who have misplaced their keys (or a would-be thief). But it is an urban myth, so save your tennis balls and be thankful that this doesn't work.
Here's a short video ripped from "MythBusters" in 2007 that explores the tennis ball lock pick. The video quality if poor, but It's been viewed 4.3 million times.