I know that I can relate to this "selective memory problem." These problems in my experiences seem to be more traumatic or embarrassing moments. If I was asked to say the first memory of grade school that popped into my mind, it would be my favorite doll being swallowed by the mascot, Philly Phanatic, and later returned to me after I saw him "eat" the doll. Today, I dislike the Philly Phanatic and get anxious when I see it.
The text explains that people are more likely to remember the things that they did not expect to happen or those things they did not want to happen. This is definitely true in my example. I have added an old but good video of the girl who ran onto a treadmill and immediately fell off. This girl probably can not look at a treadmill without thinking about that moment, especially since it was view by many people.