Security at Aberdeen airport.
I had a cheap zipped clear plastic bag (bought from Boots as a travel clear plastic bag for carry on bags) which I used for my toiletries on an overnight trip to Oslo. (Which had been used on many trips out of ABZ - my home base).
A lady at security informed me that my bag did not meet the security standard because my bag was not disposable.
I suppressed the smile and dutifully took everything out of my clear plastic bag that allowed total visibility, and placed it into the bag offered that was indeed disposable, however - devilishly I used it three more times (I'm a rebel I know) before it fell apart, only to be renewed with another disposable bag that I actually used many times, and therefore willingly broke the ABZ security rule.
I have yet to be arrested for this lawless behaviour.