Saw something similar in a Home Depot parking lot awhile back. Lot of commuters use the lot so its always busy, pulled in last row and could see a black guy in his car with music on, talking to a woman in her minivan window to window. Didn't think much of it, came back, both cars still there but light bass of his music coming from his car, I look over and they are in backseat of minivan and she is bouncing like this.