Mr. Ranganathan taught us Calculus, which was a horror for most of us.
He was teaching the chapter 'Limits'
Limit X--0/sinX =1, he said, and we never understood. On seeing our pitiable faces, he tried to explain:
" Suppose you start running from the class to the Mess now, with a special condition that every second you run, you cover half of the remaining distance to the mess, which means that you will get closer and closer but never reach the Mess for lunch."
How wonderfully explained. I can never forget that equation.
But when the same question was asked in the examination. Putch(714) wrote: 
Limit X--0/sinX = 1
Limit X--0/1 = No lunch
therefore  Limit X--0/1= Sin. (a big sin)

Madhu (824) and John Cornelius (732) were in Mr.Prabhakar Rao’s Social studies class on Christianity, John was as usual sleeping.

 Mr.Prabhakar Rao  asked: "Who created the Earth and man?"

 Madhu poked John with his pen, and he screamed, "My God!"

 Mr.Prabhakar Rao looked at John and said, "That's right." Then he asked "Who is God's son?"

 Once more Madhu poked John with his pen, he woke up and screamed,

"Jeeeesus Christ!"

 Again, Mr.Prabhakar Rao said, "Correct."

 Finally, he asked, "What did Eve say to Adam, in the garden?"

 Madhu poked John again with his pen, but this time he got up and screamed:

"Poke me with that thing one more time and I'm going to rip it off!"