Even when James and Sirius were nineteen, and most certainly out of school by two years, were still forced to write lines when Remus deemed that they were being morally or illegally wrong. The biggest and most serious occurrence was when James and Sirius had hijacked a Muggle digger and charmed it to move to the beat of thumping dancey-sort of music.
Remus made them write 'I must not steal Muggle industrial machinery and use it for my own personal and recreational use' seven hundred times.
James and Sirius couldn't feel their writing hands for a week.
