Have you ever watched people in the car behind you when you're stopped at a traffic light? There are lights around here that seem interminable and I often occupy myself (mostly when I'm alone) by watching in the rear view mirror to figure out what people are doing or saying.
I've watched couples have arguments. Obviously I can't hear the words but the expressions and the body language says argument. Other couples just sit there, each looking out their own window with no conversation at all. I always wonder what they're each thinking about and how they got to that point to look so distant and isolated from each other.
I've seen moms and kids talking ~ sometimes yelling or not speaking to each other at all, men shaving, women putting on makeup, lots of non-hands free cell phone talkers, young couples out on dates and laughing. I just find it fun to imagine where they are in their lives and what has brought them to this same intersection for this two or three minute interlude. Nothing all that extraordinary, just an idle pastime that lets me peek into other people's lives for a little while.