I once made a "on the phone" gesture by putting my spread fingers to my head when a driver was looking at her phone rather than noticing the left turn signal was green. As she did a U-turn she leaned over across the passenger seat (I was standing on the corner) to flip me off. Of course, one hand had the cell phone and the other was now flipping me off, so her driving wheel started spinning freely and her SUV straightened out in the middle of the turn. I loved the look of shock as her vehicle careened around before she got it back under control!