I hate that. And I hate when I go to a movie, and the guy at the snack counter goes, "Enjoy the movie." And I say, "You, too."
That's a Chicago answer. Haha QT @broox: Someone just said, "how ya doin?" to me in passing. I answered, "yep" ... wtf, brain.
Must be genetic. I'm so used to being w/ the kids that when I'm alone at the store, I say, "Excuse us." Always gets odd looks.