A pupil hacked into their teacher's computer to change grades after finding the password on a note stuck to a laptop. After obtaining the password, the pupil was able to access more than 20,000 records and change their grades

https://www.dailymail.co.uk/news/article-9498935/Pupil-hacked-computer-changed-grades-GCHQ-begins-cyber-security-training-teachers.html