Most of the crowd had no idea what was coming when Cee Lo Green's "Forget You" started playing at the Seminole Heights Sunday Morning Market.
Women suddenly started popping out from under the fruit and arts and crafts tents scattered across the lawn of Hillsborough High School.
Halfway through the first verse, about five women were dancing in front of the speakers. Then 15. Then more than 30.
The Sunday morning market had been hit by a flash mob – a coordinated public demonstration that's meant to spark a reaction or encourage participation from unsuspecting bystanders.
"Who was that?" said a confused Ann McDonald, who had been shopping at the market. "I heard the music and I looked over and here are all these women."
A group of buddies in Jazzercise classes across the Tampa Bay area had been planning Sunday's flash mob event for months. A couple of the organizers for the market were in on it and expected the flash mob to start about 11:15 a.m. At 11:16, the live band stopped playing, and the DJ signaled the cue.
"People aren't really sure what Jazzercise is anymore, so we thought: Let's just do a flash mob," said Deb Goldman, who performed alongside her daughter, Kate Gray.
"We figured we'd start out Mother's Day with a mother-daughter thing, go dance and people see it and say, 'What is that?'"
The point behind the "mob," consisting of women from their 20s into their 50s, was to encourage women of all ages to exercise.
"More and more moms are working or have second jobs," Goldman said. "They're running their kids everywhere, and they don't take time for themselves."