Why do ..

... men wearing black trousers and black shoes persist in wearing white sports socks ?

... women, who've dyed their hair blonde, not bother to re-do their roots from time to time ?

... people not wait for others to get off the train/metro/lift before trying to get in ?

... old, wrinkly, retired people wait to do their shopping at 6pm ?

... people never have their money ready to pay in shops ?

... cashiers let you queue for ten miniutes before saying "sorry, i'm closing now" ?

... people leave their mobile turned on when they're on the train "speak up, i can't hear you" ?

... u.s films and t.v shows always, unmistakably, have an unfeasibly happy ending - every time ?

... films start and finish earlier than indicated - only when we really, really want to record them ?

... marketing people make adverts for products that are impossible to find ?