School was having a blitz on uniform. I asked a student why she was wearing non-uniform, got a lengthy Vicky Pollard-esque monologue about why. I asked politely if she could untuck her jumper from the tops of her jeans so that it was less obvious that she was wearing non-uniform. She refused and ended up with a detention for the prolonged arguing and reference was made to the uniform. I recieved a complaint that I was bullying her and we ended up wasting a significant amount of time going through the records of various sanctions and why to prepare for a meeting with the parents to prove that I wasn't bullying her.
The ridiculous thing after going through the stress of these kinds of meetings is that the outcome is that you promise to do what you should be and actually were doing anyway, and the pupils make promises that they should actually behave in a reasonable way 
Apparently I shouldn't have issued a detention for the pupil loudly banging my glue stick on the desk while I talking to the class. I had just spent £30 of my own money on that class set of glue sticks because the school had no budget for them, and no pupil bought them and somehow OFSTED and the MAT expected beautifully presented books with all work glued in 
Early days of phones in school... I confiscate a phone in line with policy... pupil sends a message via their mates phone so the parents turn up to reception to claim the confiscated phone and kick off because I haven't taken it down yet... I'm sti teaching the same class and haven't left the room!
School policy, no coats in school (including coridors). Lesson 2, I ask pupils to take their coats off. Later HoD comes in saying there's been a complaint about having to take the coat off and the classroom was too cold. I pointed out that I was only following the school's own rules and while the classroom was not the warmest due to a chronically malfunctioning heater, I had survived working in there on my own in the previous hour.
So, so many over the years. Too many management teams indulge the indulgent parents then wonder why they struggle with a certain core of pupils and pass the buck back to the classroom teachers.
I've been out for a few years as I wanted to have some quality time with my own kids instead of wasting time on a few where the chances of fruition was minimal. I miss the actual teaching, and most were lovely to know and even teach, but there is too much unnecessary distraction away from what actually benefits pupils in the classroom and ultimately my kids needed my time more. Too many young people leave the education system having never faced the natural consequences of their choices and attitude and it's often very late by then.