A teacher is teaching his class when he notices a student fooling around with a metre stick.

He tells the kid to stop, as it’s distracting. The kid does. A few minutes later, the kid is tapping his desk with the same metre stick. The teacher tells him to stop, so he does. Later in the class, the kid is poking his classmates with the metre stick. Once again, the teacher tells him to stop. Finally, when the kid starts poking the teacher with the metre stick, the teacher’s had enough. He takes the metre stick from the kid and begins chastising him. “That’s it, I’ve had enough of your disruptions!” he yells. “What are you even measuring with that?!” The kid looks up at him. “Your patience, sir.”