memorable moment should be a happiest moment in ur life,not 
a sad one,try out speaking about any great achievement in 
ur school or college days.ex;wining a match,or stood topper 
etc which should create a positive impact on interviewer

ABOUT MEMORABLE MOMENT, IT IS NOT NECESSARY THAT THE 
MEMORABLE MOMENT IS THE HAPPIEST ONE, IT COULD BE EITHER 
HAPPIEST OR SAD. SOME TIME WE MEET WITH AN ACCIDENT AND 
THAT IS THE MEMORABLE MOMENT BUT A SAD MOMENT OF OUR  LIFE, 
BUT MEMORABLE MOMENT MUST BE OTHER THAN ANY OTHER ORDINARY 
DAYS. SOME TIME IT ALSO LEAVE SOME  GOOD OR BAD IMPACT IN 
OUR LIFE... FOR Eg:- "THE MEMORABLE MOMENT OF MY LIFE" IS 
WHEN I WAS DOING B.A. I FACED MOST DIFFICULT SITUATION IN 
MY LIFE AND THAT WAS "SHORT OF MONEY" BUT I RESOLVED THAT 
PROBLEM BY TEACHING SOME STUDENTS AND THE TIME WHEN I GOT 
MY FIRST SALARY IT BACAME A MEMORABLE MOMENT OF MY LIFE.

Most memorable moment that means it may good or bad. my
memorable moment is "when i was traveling on a fly over i
met an accident .that was very terrible accident i saw first
time in my life. i still remember that accident.this is my
unforgettable moment in my life.

Note to all:  Memorable moment is something "WORTH 
remembering", do you think bad/sad moments were worth 
rememembering?, i dont think so...

So logically speaking we're really pointing on the most 
happiest moment of our lives, that is for example when my 
younger sister was born, or when i first saw my Girlfriend. 
or your scholastic achievement e.g. when i graduated as cum 
laude, stuffs like that...

s I agree wit NAVED, MEMORABLE MOMENT means it COULD BE
EITHER HAPPIEST OR SAD. for example: Think tht u have a gal
frnd n u both were in love since 7 yrs , n  suddenly one
fine mornin if she break ur heart wht u ll do tht to for a
silly reason(nothin but dump)so is it not a memorable moment
4 u, how can u or me 4get dis moment.....if u 4got dis
moment, its clear tht u dint loved her truely