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Published 11:29 23 Sept 2015 BST
Updated 12:35 23 Sept 2015 BST

For years, to separate the men from the boys, scientists devised to a list of 40 questions to determine the true narcissists.
Well, now there is only one needed, as you'll see in this short clip...
https://youtu.be/6-LUAKLMaS0
Clip via New York Magazine
So there you have it, be sure to test this theory on your nearest and dearest later today.Explore more on these topics: