you are at the mall and a song comes on with a cha-cha beat (1-2-'cha-cha-cha').. and your feet automatically start moving.
And you are three patterns in before you even realize you are dancing.
Oh yes, this happened to me. And I was in the middle of a spot turn when I realized what I was doing. I had to just say to myself over and over "NO - NO DANCING IN THE STORE!!!"
So I made it through the cha-cha. The next song was a Middle Eastern piece that was perfect for belly dancing. Again with the hips! There they go! Figure 8's just start without a thought. At that point, I left the store before I made too big a fool of myself.