My grandson thinks I'm crazy. When I come across a store employee who is not very friendly, I make sure I greet "them" first with a big hello and ask how they are doing. I make sure I give them a big thank you and wish them a good day when I'm leaving. It really confuses some people, but it makes my day. Of course, you do have to get used to the strange looks that you get when you do this. Sometimes it does change their attitude, but not always.