It's a real-world solution that is widely-known but not widely understood. https://old.reddit.com/r/explainlikeimfive/comments/1ycw61/eli5_why_does_putting_a_p

It's a real-world solution that is widely-known but not widely understood. https://old.reddit.com/r/explainlikeimfive/comments/1ycw61/eli5_why_does_putting_a_plastic_bag_or_receipt/cfjckl8/ https://old.reddit.com/r/explainlikeimfive/comments/1ycw61/e... No idea if this explanation is legit, but I can anecdotally confirm that the trick has permitted a purchase in one case in my own direct experience.