Self-bondage Challenge
OK, lefties, set the key to the handcuffs just behind you on the floor. Then reach your right hand behind yourself and across your back, and lock it into the cuff on your left side. Now, without locking your left hand in the other cuff, reach your left hand behind your back, under your right arm but over the belt, so it is near the cuff on your right side.
Now keep your left hand in that position near the right-side handcuff, and pretend that it is also locked in. With your left hand in that position, reach down and get the handcuff keys, and free your right hand. Obviously, if you are unable to do so for any reason, then pull your left hand out from behind your back and use it to free yourself. Then do whatever you need to do to fix the problem you had, including getting looser handcuffs and re-tying yourself if necessary. Once the problem is fixed, repeat this test without actually handcuffing your left hand.
Do NOT continue until you can easily and repeatedly free yourself from this position, while keeping your left hand in position as if it were handcuffed. Once you are certain that you would be able to free yourself with your left hand cuffed, you may press "Continue".