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lucky day or what, she!?
Thanks for the vid.. I had read FLOTUS, POTUS, and Bo had made a surprised appearance during the White House Visitors' time.
Michelle has done that in the past and from the aritcle.. on the Anniversary of PBO's Inaugurations..
http://baltimore.cbslocal.com/2011/01/20/michelle-obama-surprises-white-house-visitors/
Here's a link to a surprise interaction with White House Visitors from Michelle.. it doesn't say what year, though..
http://www.concierge.com/video/conde-nast-traveler/condeacute-nast-traveler/condeacute-nast-travelerdestinations/15202147001/michelle-obama-greets-white-house-visitors/76418408001
Thank you, she 
So Warm and Gracious. So very Genuine. The sweet hugs she gave everyone...and and and she knows sign language. That a beautiful moment! 
There's nothing our first lady can't do!
And yes, Cha...it sure would have been a lucky day to meet them both.
I couldn't believe my eyes.. but, I don't know why I couldn't imagine Michelle knows sign language too!
When I was still in New York I saw a vid of her surprising White House guests and I thought she had Bo beside her. Anyway, it made me want to go visit the White House before I left and hope we got a surprise visit from the First Lady. Alas, I never got back to D.C. before it was time to leave the Mainland.
I have a little place in my heart for these unexpected appearences by Michelle and now the President when People come to the White House to soak up the history!
What a gracious couple! I keep saying this, but we are so luck to have them in the WH!
You don't need to stop saying that on my account. I am right there with you!
I've been looking for this!
Leave it to Chipsticks to find it before we do!