I immediately thought of the "5 monkeys and a ladder" psychology study, in which the first monkey attempts to climb the ladder to get a banana and all of the monkeys are sprayed with water. Then one of the monkeys is replaced with a newcomer, who then tries to climb the ladder, but this time, the remaining original monkeys attack it. And so the replacing of the monkeys continues, until none of the monkeys knows what…
It's a bit like when there's two cash machines, with a long queue at the first but no-one at the second. You can see people looking at it, wondering whether it's worth the humiliation of finding it's broken and having to go to the back of the queue, or the joy of finding it is working and getting one over everyone else. Often nobody cracks.
Their places have X number of cash machines, yet only one of them is in use even though there is a massive queue.
And if you wander up to one of the unused ones you get yelled at...