Windows 10 - Cortana Easter Eggs

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Cortana is Windows 10 new assistant. Cortana comes from the Halo game series and is similar to Siri or Google now in function. Just like some others, Microsoft has built some "Easter Eggs" into Cortana's functionality. I go over 10 of the Easter Eggs, but there are plenty more. Find any I didn't mention? Let us know in the comments below.
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