A simple verbal fight between you two about grades in the dorm commons. All that started it this was you refusing to study night and it turned to you two insulting each other on your flaws, you two normally didn't do this, and when you did it never went this far. You said something along the lines of 'I'd rather not be obsessively attached to books like you.'
Tenya said under his breath, without thinking, "At least I don't cut." The other students looked in shock, including him.