From the “use this for good, not evil” files comes a fascinating instructional video on how to pick a lock with a “bump key”—a key modified to fit and open any lock.
Like the instructor in the video says, thieves have been using this technique for a long time now—so it’s interesting (in the “knowledge is power” kind of way) to see how it’s done.
Please keep in mind that this trick is for emergencies only, but not to make evil plans. Don’t go getting yourself arrested.