I KNOW WHAT YOU DID LAST SUMMER

Everything was going well with the boxing champion Mark until one day his opponent whispered in his ears,"I know what you did last summer!",to provoke him while they were having a battle on the ring.Mark was taken down by the opponent within less than a minute after he heard that.Why did those few words bother him so much that he was actually beaten by a mere rookie?Let's find out as we read through the story!