The Misplaced "You Too"

Do you ever leave somewhere, such as a restaurant or a friends house, and they say their last words of their goodbye and then you feel as if you have to say something back and wish them well too. I do this often and then I always say "you too" without thinking and many times this wonderful end to a goodbye leads me astray and embarrassed. I do this every couple of days and feel just as retarded every time. The checker at best buy says "enjoy your movie" and I say "you too", realize it and walk away quickly-"have fun at the park......you too".-"enjoy you're food....you too." It goes on and on and sometimes, if I'm lucky, it actually works-"have a nice day......you too".