To let me prove my point let me cite a few examples ( cite not give , you will know the difference if you have studied chemistry ) . Ever notice your physical instructor at your school and by schools I mean most Indian schools. Because I do not know much about other countries who have NFL players as coaches to students or ex-basketball player who was caught doing drugs during his career and has been relegated to this position by life the great teacher. But here in India you will find the physical instructor to be the most unfit person in the school , he chews tobacco speaks bad or broken , disjoint, disparate English, flaunts a family super saver pack and beats you like a local hawaldar if you do not listen to his broken , disjoint, disparate English. While on the playground he would probably tell a student to get a stool for him to sit and tell him to run otherwise he would beat the crap out of him. He perches himself like Buddha under the shade of tree with a whistle in his hand. And any kind of misbehavior on the ground leads to severe punishment like lifting him from his stool getting beaten up by him , he beats the crap out of you just to get the blood flow going in his body.
Then you will have your math teacher a guy who most probably will have receding hair line. This increases his ability to think better as his head is an open book. He will usually be the most unorganized, confused person in the world and will make math for you as confusing as it possibly can be. He loves the number but will keep forgetting your name hence you will be probably be known by your number like a jail kaidi . Then he when the math gets heavy will probably dish out cold number jokes. Like 2 times Reena (roll no 2) is equal to 1 Suresh ( roll no 4). If you put A (roll no 6) in a square you will get B (roll no 36)
Then you will have your biology madam because subjects related to medical and paramedical are preferred mostly by the ladies. (They simply love cramming). They are like Matrix’s Keanu Reeves who like a hard disk stores anything and everything. The ultimate irony is that they hate violent movies but they absolutely like cutting human corpses and studying them for the sake of it. They cannot see a bird dying but they can work at a morgue with a damn dead body. They should be featured in the most dangerous jobs in the world show on NatGeo . They like to cut through intestines, spleen and don’t know what else stuff. They make friends with the dead corpses and call humans as subject, specimen or a sample (how cold).
I think in a way I have proved my point here. Of course this theory is open to discussion and can be contributed with better examples like the history lecturer being the most boring of them, literature professor being the most abstract of them but come on now I am writing a post here not a book.