Riley mentally slapped herself in the face. Obviously she was slowly going insane, because no one in their right mind would give Sirius sugar. Especially right before Transfiguration, as he would do something incredibly stupid and get them all detention.
"WOO-HOO!" Sirius yelled, jumping on top of the desk. Two seconds later, Professor McGonagall walked into the classroom, and pursed her lips at the sight of Sirius.
"Black, what are you doing?" she asked. Sirius looked down, finally noticing the professor.
"Oh. Hello, Professor,"
"Ten points from Gryffindor,"