One year, just as the school year was finishing, and it was that last week of school where all the reports are done, there's no more work and there's nothing left to do.
We'd already packed up the tables and stacked the chairs in the corner of the classrooms and gone into the presentation space to chill for the last couple of hours before we could go home for the Summer holidays.
With nothing else to do; the teachers decided to put on a movie. That movie was Shrek.