Standing in the queue of the supermarket, I often undergo the following scenario: The person in front of me just wants to buy some bottles of wine and nothing else. So here is the question: Why is it so difficult to put theese bottles in a way that they are aligned with the direction of motion of the conveyor belt which would prevent them from moving and colliding with each other all the time? Some people lay them down perpendicularly to the conveyor belt, some even place them upstanding and do not even seem to recognize that inertia is a phenomenom not beeing restricted to the outside world of the supermarket. One should place signs at the cash desks saying “Be aware of physics!”
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