In many ways, a watermelon is a lot like a Christmas gift: You're pretty sure you're going to like what's inside, but you're never really sure until you open it. It's not the case for lots of Chinese watermelon shoppers though! We tap and knock on the watermelon and let it speak to us.

A sign asking customers 'not to knock on watermelons' in an Italian supermarket has recently caused much upheaval on Chinese social media, where many people think the no "watermelon knocking" policy is specifically directed at Chinese customers.