Abstract
In this paper, a surprising behaviour of the store security tag is elucidated. We explain why one can easily introduce a steel pin into the tag, while it is impossible to pull it out even if you use extremely great forces. Unexpectedly there is not any sophisticated device inside the tag, rather the whole job is done by a small steel ball placed in a simple, bucket-like container. The asymmetric behaviour of the pin follows from a specific positive feedback loop, enhancing the maximum value of static friction, that occurs only when one tries to draw the pin out of the tag.
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