Nutters
I know facts are thin on the ground however I find it frustrating that passengers can try it on at will and then if unsuccessful they could be dismissed as "sorry I thought it was the loo door and i was desperate to get in" with a slap on the wrist.
Most likely this was a genuine false alarm however it is all too easy to trigger a full emergency response and incurr huge costs and distress. I really hope there is some point of law that can be brought against these kind of nutters and set an example. There has to be some dis-incentive or else we will end with every other flight going through a anti terrorism exercise.