Two true snippets from the first school I worked in, in Poplar. The head of science (let's call him Turner) was cleaning graffiti from the wall outside his classroom when he spotted, written in pencil, "Turner is a cunt and a half." He said "I'm bloody proud of this - it means I've made my mark!" He left it there for as long as he could, unlike all the other stuff. Another time, Mr Whitehead (let's call him...) spotted, scrawled on his classroom door frame, "Whithead is a bastard." Enraged, he seized a pencil and inserted the missing letter 'e' :-)