Whenever we tell a story to a friend or family member it usually is about events beyond the ordinary: extra-ordinary. Events that are worth picking out of otherwise pretty routinary days.
We do not tell every single thing we do during a day because, first, it would be impossible to narrate: to narrate a day exactly the way we live it would take at least a full day (first I took a step, then another one, then one more). In second place, it would be quite boring as well. We all know what it is like to ride the bus during an hour and a half and it would not be very exciting to listen to somebody telling us about it.
This way we do not tell our whole day of work but we do tell about a meeting in which our boss let us know about the chance for a promotion. We do not narrate the whole time we waited in line in the bank but we do tell that two men wearing masks entered the bank with intentions or robbing it. Finally, we do not tell how we saw several pretty looking women at the college campus but we tell about how we talked with one in particular we met that day.