I don't know about others, but I say all sorts of things to people when I see them besides 'How are you?' The casualness or silliness of the greeting depends on the setting and on how well I know someone (and sometimes, how much of a hurry I'm in). Crowded place: "Oh, hi. I can't believe we all wound up here at once." Or, "did they send a memo telling everyone to show up at the Wal-Mart?" Beastly weather: "Hi. Oh, my gosh, the streets are flooding." General: "Hi. Great minds think alike!" "Hi, nice to see you."

If I sat and thought for awhile I could probably come up with a lot more, and yes, I do ask people how they are doing or how their weekend went if I know them well. Otherwise, probably not.