Obviously, if a teacher leaves a blackboard unattended with chalk nearby, they must want you to use them. Writing "Gary is Gay" was par for the course, but the truly creative would look out for unattended boards with teachers' content on, and make subtle alterations. This had the bonus of not always requiring chalk, as a well-executed rubbing out of a letter or part of a letter could be just as effective, eg removing the 'o' from 'count', or, even better, removing the 'c' and rubbing out the rightmost quarter of the 'o'. Statistical charts are ideal for adding mountaineers or tightrope walkers. Our pinnacle was infiltrating our form room and spending lunch drawing a huge chalk Jesus, copied from John Bolton's 'Prester John' artwork in Warrior. It was the best drwaing ever drawn in that school, and the teacher let it stay up for a week (there were two boards), although he never mentioned it once.

For the revolving whiteboard scenario, where the boards are lifted and lowered to reveal fresh panels, the class can prepare for the teacher by concealing a massive, gushing, member on the rear board. Half-way through the lesson, when the teacher needs mo' whiteboard, bingo! Guage the teacher's reaction; did they go red, and not know what to do? If so, congratulations.

Another way of contriving this is to write PLO (teacher talk for "Please Leave On") on the full blackboards, and drawing a gusher on the rearmost panel. As the teacher searches for a clean panel, the cock draws ever nearer...

Every time the country had a general election, our school would have a mock election. 6th formers would form political groups, make outlandish promises, and then do fuck all once in power. It was pretty realistic. (Satire)

One morning, while messing around in our form room before class, someone sneezed near the blank blackboard, spattering a huge amount of snot and phlegm across it.

Not one to miss an opportunity, Matt drew a big circle around the dripping greenie, and wrote 'Vote for the Gob On The Board party'

Next assembly, our headmaster performed a dictatorial coup by telling us the elections were off, thanks to the disgusting contribution made by an unknown person in 4A's form room. We of course, laughed until tears came down our faces...well, the boys did. The girls thought it was disgusting too. Tcha, girls.

What you do is, you get a permanent marker, the sort that won't come off, and you write OUT OF ORDER across a whiteboard. That wasn't my idea.That was Nick Baxter's. He beat some smug little shit up with a digeridoo.

A small, geeky, unassuming child tries too hard to look good in front of cooler, funnier classmates and writes "Help, I'm a prisoner in a blackboard factory. Call the police and save me." on an unattended blackboard.
The small, geeky, unassuming child then has the shit kicked out of him by the cool kids he was so desperately trying to impress.
In the back of his mind he's sure that lesson applies to this website somehow, as well.

Kids usually write other poeples names on the unattended blackboard - ie smudger is a twat, or some such similar. Being a bit dim I thought no one would be stupid enough to write their own name on a board, so I did, thinking that someone else, anyone else, would get the blame. Unfortunately, there being no markers around, I used one from Terry's pencil case, and it was a permanent marker. so the words 'Jon Robinson wrote this!' remained on the board for a whole week, as no one would own up to writing it. They eventually came off with lots of rubbing.

The larger 'Rollaround' blackboards were just large enough to hide a smaller member of the class. Once, prior to our maths teacher appearing, Ian Wright (no, not that one!) hid behind the blackboard armed with a piece of chalk. Throughout the lesson Mr Riat was most confused when the things he had written at the beginning of the lesson had mysteriously disappeared when we asked to him to explain them again.
Mate, I would have had as much faith in your story if you'd said it WAS 'that' Ian Wright. If you expect me to believe that your mate was the elastic bloke out of the X-Files and that Mr Riat didn't notice a pair of legs coming out of the bottom of the board, then, well, you'd better blummin' well think again. Do you remember shortly after this happened, you woke up and ate your cornflakes? - Mansh

1. Write the letters W-A-N-K-E-R using the technique of licking a finger, writing the letter, and then vigorously pounding the blackboard eraser on top of it so the chalk dust sticks to the moisture.
2. Cover the blackboard with 'normal' writing;
3. Then wait for the teacher to come into the classrom and clean the blackboard at the start of the lesson. The 'normal' chalk words are removed and HOOP-LA! the word 'WANKER' remains.
'Proper' vandals may consider the use of Pritt.