Saturday School
My high school required you to attend a certain minimal number of classes a year in order to graduate. If you missed too many days, they made you go to “Saturday School” to make up missed days. But Saturday school was great. It was just half days of sitting quietly reading a book.
In any case, I realized that they didn’t track when you were absent and when you did Saturday school. So I just went to every Saturday school to build up credit so I could skip days later in the year whenever I wanted.