Golden days

Picture 1:
In Durgapur, I was in a class with another 60 odd students and an aged, bald teacher was trying to teach us a complex mechanism of an electronic circuit. After lunch, it was a boring class as usual. So we kept ourselves awaken by throwing (read shooting) chalks (read bullets) to friends (read rivals). Unfortunately (or fortunately!!!) few bullets (chalks) failed to hit its assigned target and hit the most precious object (girls) of our class. One of these bullets didn't follow the rule of projectile motion and hit clean, well maintained, distinguishable head of our beloved teacher as if a ballistic missile hit a reservoir of petroleum oil. Result was obvious. A Big Explosion took place. No way to exit!!! So the class was suspended for weeks.