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Published 11:23 7 Sept 2015 BST
This being said, sometimes it's impossible to be at your most attentive, especially if you have a double business studies class on a Monday morning and your mind is completely drawing a blank.
I've previously discussed some of the problems that come along with being a teacher and it seems that this man in the Netherlands was having a really bad day in the classroom.
Take a look at how he reacts after noticing that one of his students is nodding off in the middle of class.
I wonder if this technique might catch on in some Irish secondary-schools? Take a look.
https://www.youtube.com/watch?v=X9ljIgH1ngg
Clip via - NewsVideos365