Some kind of natural rule that you can't ignore.

The other day, an elder Hispanic gentleman walked into my office. When I asked him how he was doing, he smiled toothily and said in his crackled but soft Hispanic tone, "So far, so good." Without pause he continued, "There was once a man who cleaned windows for a living on the very tall skyscrapers. One day he lost his balance and fell backward off his lift. He was falling down many stories of the building, when someone stuck their head out the window and asked, 'How are you doing?' The man looked down at the ground fast approaching and said, 'So far, so good.'"

Though he smiled as though there may be some cultural meaning lost in translation, I knew instantly what he meant. I've second guessed complaining a lot since then.

If you want something to keep your attention, try checking this guy's collection of WWII posters out on Flickr! I had to stop browsing because my eyes were hurting. Good stuff.