Mrs. Obama took part in some “eat as I say, not as I do.”
From the local NBC affiliate, WTMJ:
First lady Michelle Obama thrilled staff and customers when she made a surprise visit to Miss Katie‘s Diner on the city’s near west side.
Mrs. Obama met her cousin and her cousin’s daughter for lunch at the restaurant.
Jennifer Laschen waited on their table. “I’ve been doing this for 25, 30 years and I’ve never had such a thrill, such an honor to wait on a first lady in my life,” she said.
Laschen said the first lady ordered a cheeseburger and fries. Mrs. Obama took pictures and signed autographs for the staff at the diner and their customers. [Emphasis added.] (Source)