When your Sim has a high reputation, some Sims will spontaneously applaud, when they see your Sim. Sometimes, they will clap, when they pass your Sim's house & get that icon of your Sim's face above their head. I seem to have seen some sort of dialogue, that said something about good Sims. I know Geoffrey Landgraab seems to always cheer, when seeing my Sim, but I'm not sure if it's coincidence, or just a general reputation reaction.