If you notice a strange purple mark on a fence, pole, or even a tree when driving along the road or hiking through the woods in the USA, remember it's a sign advising you not to trespass on private property. Different countries have different rules and traditions that might seem weird to foreigners. In Greece, there is a law that bans wearing high heels at any historical monument! Since 1992, chewing gum is officially banned in Singapore. Let's go on a trip around the world to find out more interesting rules. 

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