I Believe Smiling At Somebody Can Change Their Day

I remember one time in Barnes and Noble this past Mothers Day Weekend, a girl smiled at me and my mom. I saw this girl when I was behind a shelf and went to the open to get a better view that's when she looked over and smiled at me and my mom. She looked like she was in her late twenties and had black hair. Me being so shy, I didn't want her to think I was a creeper standing their smiling at her so when she did it, I looked away. The moment made my day. I just hope she knows I'm shy and not rude.