We're not sure when this feature was added, but Cortana can now do impressions. Simply ask Cortana to "do an impression," or "do an impersonation" and listen to some of her responses. There are not many impressions right now, but definitely try it on your device with Windows Phone 8.1 Preview for Developers. We've tried it on our Nokia Lumia Icon. Head past the break to watch our hands-on video.
Recognize any of the impressions? Cortana's responses are part of a feature called Chit Chat. While her biggest strength is her ability to improve your life through organization and adaptation, she's more than just another digital assistant. She has a personality and sense of humor. If you haven't done it yet, you can also try asking her where she comes from, when she was born, ask her to tell a joke, or ask about Siri.
How would you rate her impressions? Let us know in the comments!