What gives you a "warm feeling" inside when playing?

It's the little things, the animations Sims perform that make them seem like actual people. In Sims 2, which I've been playing lately, Sims jiggle their foot when they watch TV, or the clap and snap some do when walking around, or how couples cuddle in bed together and do a bit of pillow talk before sleeping for the night. It's one of the reasons I rarely use FF.