It's wrong to skip detention.
Billy threw a rock at a classmate during recess and was given detention after school as a punishment.
Billy wants watch his favorite baseball team after school.
Billy goes to detention and asks if the teacher could provide updates on the score of his favorite baseball team.
Billy skips detention and goes home to watch his favorite baseball team on television.
The teacher likes Billy's politeness and ends up letting him watch the game in detention.
Billy enjoys the game but is punished by now having to serve three detentions in the next week.