Hacking the System

Lets say that you have the ability to hack into the school's computer system and change people's grades. Would you change your own? Why or why not? Would you change the grade of a friend, who's a basketball player, in order for him to get a scholarship to play for a university?

Out of all the dilemas listed on Haiku, I felt this one was the most interesting. The other dilemas are interesting too, but I still like this dilema the most, even if my answer to this dilema is pretty obvious to me.