"wonderful group experience!!"
How I did it: I heard about a flash mob that was sponsored through a Zumba class and I got the info, taught myself the dance, and met up with the group at Nordstroms. We got divided into groups which instructed us when to start dancing and what area of the store to shop in (I was group 1 and the Shoe Dept). We received empty shopping bags and pretended to shop for 10 or so minutes then the overhead music stopped and the dance song started playing and we all took off our hoodies, put down our bags, and started dancing. It was awesome!
Lessons & tips: Really get into the acting aspect of it. :-)