ALEXANDRIA, Va. (AP) - They called it "random dancing" but First Lady Michelle Obama broke out some moves that looked like subdued versions of "The Jerk" and "The Mashed Potato" during an appearance at a northern Virginia high school.

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Mrs. Obama joined the cast of Nickelodeon's TV show "iCarly" Friday morning at Hayfield Secondary School in Fairfax County.

The appearance promoted an upcoming episode featuring Mrs. Obama in which she thanks military families for their sacrifices.

On the show, star Miranda Cosgrove plays the daughter of an Air Force colonel.

A staple of the show is a segment of random dancing, which Obama performed both in the episode and on stage Friday.

Obama said she watches the show with her daughters, and wanted to appear because it dovetails with her campaign to support and recognize military families.

Last year, Obama went to northern Virginia to deliver the commencement address at the high school on Quantico Marine Corps Base.

Hayfield, few miles south of the Pentagon, was chosen in part because it is home to large numbers of military children.

During a question-and-answer session with students, Obama drew a handful of playful boos when she was asked about school lunches and talked about legislation she and her husband supported to add more vegetables to the school lunch program.

Taking note of the reaction, she said, "But this is for you all. ... It's hard to do what you do if you're not healthy."

She concluded with a simple admonition: "Eat your vegetables." She also handled other student questions: Asked what super power she wished she could have, she said, "You know what? I've always wanted to fly. When I was young, I used to always have dreams about flying."

Her favorite room in the White House? The Yellow Oval Room, which opens up to the Truman balcony.

"It's one of the few places the president can walk outside and be by himself," she said.

Her favorite TV shows? Besides "iCarly," Mrs. Obama said, "we watch all kinds of things. We try not to have too much TV time during the week, though."