A couple of examples from when I was a mere slip of a yoof.
I was driving along, went through a green filter arrow, 50 metres later there's a red light so I stop. A police car pulls up alongside and tells me to pull over on the other side of the lights. I did this, got out and he asks me why I went through a red back there. 'Ah!', I say, 'it wasn't red, there was a green filter, I went through the green, turned left not straight on'. He insisted it was red, I insisted it was green and it all began to get a bit heated.
At the point I finally conceded, I said something vaguely along the lines of how I was really really sorry hadn't meant to and was sure I hadn't but he was the police and in power so sorry. At that point his chum chipped in before the first officer could respond and said 'right, well now you've admitted it we can all move on, don't do it again'. Clearly good cop could see that bad cop was being a dick.
Second one was a bit odd. Got stopped and accused of drink driving. Told them I hadn't had a drop in days but was happy to be tested. They said they didn't want to test me but I had to leave my car and walk home. I said I thought that was a bit odd, telling a drink driver to walk home rather than testing or arresting him. Conversation went on like that for a good few minutes. Eventually for some reason, I announced I was sober but bored and was getting in my car and going home. They stood there and watched me get in the car and drive off, never stopped me, never followed me.
Weird.