Me and my girlfriend were doing it in the back of her car in the car park of a local park, we were pretty into it and didn’t notice about 7 cars come into the park for a group fitness session, suddenly the area was full of people and someone mentioned the rocking KA (the car we were in) so we both got quickly dressed, jumped out and got in the front, both my math teacher and law teacher were in the group, my law teacher never mentioned it but my math teacher made a suspicious number of car references the following week.