He takes out his phone, puts it on speaker, and dials a random number.
— Hello, may I please speak to Dave?
— No, I’m sorry, you have the wrong number.
— You see, students? That’s surprise. Now allow me to show you irritation.

He dials the same number again.
— Hi, can Dave come to the phone?
— I told you, you have the wrong number.
— That’s irritation, my friends. Now let’s look at rage.
He dials the number a third time.
— Is Dave available?
— Listen to me, you !d!ot! If you call this number again, I’ll come over, break that phone in half and stick it where the sun don’t shine! And if it doesn’t fit, I’ll kick it in with my boot!
The professor is pleased.
— And that’s rage.
