Last one now. sorry for having so many, I must be evil.
If you dont like someone at school/college/uni/work. Wait till they leave the computer and open up their important documents and then proceed to add random words, sentence or whole paragraphs in places where they wont notice. I once sabotaged a friends business studies coursework by explainging how much Chinese people like rice at various intervals throughout a 20 page report. Needless to say the lazy twat didnt proof read it and failed after the teacher refused to mark it.
( Nimble Colin camera-wrangling, globe-trotting whisky enthusiast, Fri 14 May 2004, 5:35, Reply)