Sadly, you got detention because you got caught cheating in class. It didn't seem that bad. You only had to go for one day.

You walk down to an empty classroom where detention is being held (The twins blew up the headmaster's office and only Fred got caught). When you open the door you see Fred Weasley, your enemy.

"McGonagall had to go find a random first year." He groans, not looking up at you.