Ok. Right.
Bit of a backstory to this one. There was a kid in my sixth form who was an absolute, top snide. Definition of a snidey bastard. Anyway, he was the most racist fuck going, always slagging the black and white kids in Punjabi (thinking that we didn't know what he was saying, when his mate told us everything

) and then accusing everyone of racism when they complained. Anyway, he was a top dick, king of the foreskins.
So, the kids of Cockshut Hill Sixth Form are doing something to do with UCAS (it's a university applications system) and as I wasn't interested, I was just fucking around. Found a big rectangular piece of yellow card, so what better to do than draw a spongebob squarepants in full izan regalia, with a giant, curly 3D dick coming off it, and staple it to the door with a speech bubble saying "Spongebob says: Don't forget your UCAS deadlines". I must add that everybody in the room (of all races) was in full support of the spongebob (including the aforementioned dickhole, above) and we all laughed and it remained on the door.
Anyway, we had a weekly assembly on friday. All file into the hall, head of sixth form is looking pretty stoney faced, and there are two police officers (not community support, full on police officers) there. My mate starts creasing, it's obvious what they're there for, I'm just hoping it isn't. Anyway, the police start talking about "racist propaganda" that has been stuck around the school and that they are keeping it on file, classic scare story stuff. Despite everyone knowing it was me, and me struggling to keep a straight face at the absurdity of the situation, nothing happens. Friday comes, and I think, if I can stay clear of this until monday, it'll all blow over. Go into form on friday, usual form tutor is not there, but the head of sixth form instead.
I'm sat there, hoping that there's another reason he's here, bell goes for first lesson, just as I go to step out the room, he goes "Gareth, can I see you for a minute...". LONG. I just come straight out with it and go "Is this about the spongebob". He's like "Yeah. Why did you do it?". I go "Because it was funny. I'm guessing it was (AFOREMENTIONED DICKHOLE) that brought this up?". He goes "Yeah, it was. (Sarcastically) How did you know? Look, I know you're not racist, it was funny, he made a complaint to the police so we had to be seen doing something."
Anyway, situation came to a head when because I wasn't punished in anyway (fight the power), aforementioned dickhole accused the head of sixth (white guy) of being racist, so he just pulls out his wallet, flashes the picture of him with his nigerian wife, and his adopted bangladeshi kid and shuts him up.
And that's how the police came to school because of a spongebob with a footlong curly dick advising students to meet their uni application deadlines.