Bad memories tend to effect us most because not only does it effect us psycologically but it also is something we do not expect to happen with us.The recent Hyderabad blast at Lumbini park for example has killed so many people-newly married, budding doctors and engineers, promising citizens of tomorrow.Relatives of the dead will suffer as long as they live due to the absence of their near and dear ones.So bad memories leave a scar on our lives which haunt us throughout our lives apart from the changes it does to the brain