Making cops laugh

I was driving across the river yesterday, on my way to work. I had been aware that there was a police car in the lane to my right, so my mind went into “don’t do anything stupid” mode. As I pulled to a stop at the traffic lights, I noticed that the lady driver in the car in front appeared to be putting moisturiser on! This amused me, and even more so, was the fact that diagonally behind her, were two officers watching her! As the traffic lights changed and my line of traffic moved slightly faster than the traffic on my right, I looked across into the police car and they were definitely looked like they were discussing it!