Fortune Cookies ...
As can be read <a href="http://www.chcp.org/fortune.html">here</a>, fortune cookies are no Chinese invention or at least weren't invented in China. Chop suey is another thing not heard of in China. There are some other items deemed typically Chinese by Westerners which can not be found in China or which are pronounced in a way that Chinese won't have a clue what you are talking about, e.g. Mahjong.
How about making a list of mistaken identities/ origins?
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