People tell stories every day and it is fairly easy to tell the difference between something worth listening to and something that is just small talk. It is a natural ability we all have, to know when something that happened is going to be of interest to others.
Do you want to know why the guy at work locked himself in an office and refused to come out until the police came and broke the door down? Or do you want to know what I had for lunch? You don't know the answer to either, but one is more of an unusual occurrence than the other, and that's what draws our attention.
When writing a story it is just the same, although often it may not feel like it.