How secure do you think your zipper lock on your suitcase is? The answer to that is: not very secure. Lock master Bosnian Bill published this video on suitcase security over a year ago but has only just gone viral now.

He explains that it doesn't matter how good your lock is. All a thief needs to break into your baggage is a pen. The trick is to puncture the teeth of the zipper, and then you're in!