Do you know that feeling after the exam is over? When you think of trying to discuss the question paper with your friends but the silly part of your brain says, "Dude! Just get out and leave this boring matter here and rest."
Yeah, I don't even like to think over that 'cause it gives me a nervous and awkward feeling which I can't even express. It sort of again brings back the comparison being done all over.
The answer to the question which you had been writing in the past 3 hours and dedicated almost enough by cutting away the time you devoted for other answers goes totally in vain when you get to know that your friends wrote the right answer and you were just enjoying in your bubble for the past three hours.
It's better to not think upon it again, be joyous and just let go 'cause you can't change what you have done. And talking about for future corrections of that answer....then surely your answer sheet will come back red. :P