"Students at the back!! Please remain seated and quiet to prevent any unnecessary noise and disruption!" He yelled at the students angrily, giving every single one of them a menacing glare...

He then waits until the whole class had finally settled down before he resumes his computer lecture.

He is the type of teacher you wouldn't dare utter anything stupid when in the middle of his teaching, you know very well that he could just drag you out of the class and scold you relentlessly.