One of our colleagues left the company last month, and he handled over a laptop to another guy. When that guy who took over tried to remove the laptop elsewhere, he found that the laptop was 'tied' to a cubicle using a Kensington's cable lock (or whatever you call it). Then he asked for help, before our ex-colleague left, he left a 4-digit pin for us to unlock the cable lock.
I tried the 4-digit combination, but the the lock refused to open. My the other colleague tried to pry it open with a screwdriver but was unsuccessful. We spent almost 2 hours searching for methods to open the lock via internet and Youtube, but still didn't work. I was almost going to give up, when I just tried randomly set the numbers, and what luck I have, I managed to open it!
I was lucky, really lucky, but sadly, I learnt a lesson, that is, never fully trust someone who is unsure himself/herself. And, luck really exists!