I’ve done worse @ilovelamp2 
I was driving down the right hand lane of the M6 and there was a car right up my arse tailgating me. He was literally an inch from my back bumper. If I’d had to brake he’d have slammed straight into the back of me.
I was super angry that someone was driving so bloody dangerously behind me. I pulled into the middle lane and as the car passes me I flipped him the middle finger in anger.
It was at that moment he switched on his lights. It was an unmarked police car 
He waved me to pull over to the hard shoulder and after I’d shit my pants, I braced myself for a massive bollocking and arrest. My DP, who was in the car with me, was figuring out how he’d get home while I was carted off to jail 
Copper, told me he’d been “following me for a bit because I’d been doing 60 in a 50 zone”. Then he mentioned me giving him the finger.
I politely said “Well with all due respect, I had no idea you were police. I thought you were some impatient driver, dangerously driving up my arse. You’re in an unmarked car and you were tailgating me so closely, you were scaring me. If I’d had to brake you’d have gone straight into the back of me. So I was angry and upset. Clearly if I’d know you were police I wouldn’t have done it. But I had no idea because it didn’t occur to me because of the unmarked car, nor that the police would drive in such a dangerous manner”.
He laughed it off, reminded me to stick to the speed limit and told me he wouldn’t take any action because he was about to go off duty - which was clear from the fact he wasn’t even in his full uniform.
My DP’s response after was “YOU JAMMY COW!! I bet if that had been me I’d have been carted off to a cell!”.
I always wondered whether because I had a witness to his appalling driving (and because he was already off duty when he pulled me), that’s why he let me off. Maybe he felt a complaint wasn't worth the hassle and his “pull” could’ve been disregarded because of it.
Maybe he just couldn’t be arsed to take it further to save himself some paperwork at the end of his shift?
Who knows! I was lucky that day whichever way you look at it! 