How about this one then?
When I was a kid, we were playing in an abandoned factory (the walls fell down so we didn't have to break in) with LRP weapons (Homemade rubber swords, a bow made out of curtain rail, etc, etc).
Suddenly, A helicopter flies over, two meatwagons pull up, K9 units, the lot.
We are all arrested, even when they realise it is just kids playing. They bundle us into the back of the van, and start driving to the police station. They drove past most of our houses, and we were asking them to stop and tell our parents they were taking us to the station. They refused (We were MINORS !! One of us was only 12! ).
Once we got to the station, they then and only then called our parents, who came down and demanded a written apology from the cheif commisioner on the spot there and then. They got it.
They STILL tried to charge us with breaking and entering, despite the fact that there was a 20 foot gap in the wall. When that didn't stick, they tried to charge us with criminal damage for breaking the windows. 90% of the windows had been already broken for years, we did no damage whatsoever, and the building was waiting to be demolished anyway.
And police wonder why they don't get respect...
Funny thing was, two of my mates managed to get away by jumping out a back window and onto a bus.