he's sitting all alone at his desk after class, his classmates have already left to go home/to the dorms for the night, and he's singing : "I did I did it I jumped off That cliff without a parachute, I looked over the edge and saw the view of something I could never do, and part of me knew how, But the moment came and had to be now, so, I did it, I did, I jumped, I stepped, right off that cliff without a parachute.."

he looks at him with wide eyes

"Problem child...we're having a talk."