China " Cut cake party ",You know?

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Now in China, The "Cut cake party" is hot~ what is "Cut cake party"? A group of people,they sell walnut cake. when you want to buy? OK. How much? No tell you Knife small walunt cake. you don't know how much.then you think only $10. They tell you :" $100" What? 100? if you do not buy. they will fight you and use knife and every weapon fight you. They hard sell 1 hour can make about 500~2000$ money.