One buddy of mine was always being kept after school

One buddy of mine was always being kept after school.
The only thing he ever learned in school was how to lock up when he left.
 
One buddy of mine was kept after school so often,
when his family moved to a new town, it took him three months to find out.
 
One of my buddies has been kept after school so much,
the only time he sees the outside world is during fire drills.