You were just discussing some subjects on the board since you are a teacher then Scaramouche was whispering to another student in the class you stop talking and look at him and you say.

"Scaramouche please listen to my discussion this will might be part of one of your exams."

You say while looking at him and he looks at you and he says.

"I don't even think that will be part of the exam so why would I listen to you?"

He says and he looks at you with an annoyed look and what will you say now?