A tribal farmer watching a Tarzan movie rushed out of the hall the moment a tiger appeared on screen, advancing menacingly towards the audience.
The gatekeeper trying to stop him argued that it's only a movie, to which the tribal replied: “I know it’s a movie, you also know it is, but does the tiger know"?

In the Chemistry class the teacher was describing how August Kekulé, the scientist accidentally discovered a formula to express Benzene.
Kekulé once dozed off in his lab while trying to arrange the six carbon atoms in a particular format alongside six-hydrogen. The scientific community in the entire world had no answer either. Suddenly he had a dream and in his dream he saw two snakes eating each other and suddenly he woke up and tried to write out the formula that way and that was how we got the Benzene ring as we know it today, she said.
The teacher however felt bad finding a girl in the front bench dozing off all this while and pulled her up.
A boy from the rear said: Madam, please spare her; who knows she might come up with another formula for Benzene!