Try bowling in a tournament when one of the participants has his two teenage boys (close to 18 yrs old) sitting there at one of the tables playing text message and games on their noisy cell phones. I ended up having to get the TD and he was scared to even go up to the guy to ask them to move out of the settee area because the center was in a less than desirable area of town.
Common sense and courtesy have all but disappeared from many people today. They are too self-centered and disrespectful unless it gets them somewhere and then they follow you around like you are dropping hundred dollar bills.