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It seems the Windows Phone version of Cortana has been endowed with a sense of humor (or at least her engineers have one they are expressing through her). It turns out the Microsoft programmers who created Cortana have included some "easter egg" style comedy elements into the upcoming digital assistant. For example, if you ask Cortana to sing, she will oblige you with a brief snippet.
That's not all though, there are other entertaining easter eggs built into Cortana's programming. Check out the video above for a teaser. It will be great to see how they implement Cortana in the Surface product line in the future.