When was the last time you gave a stranger a compliment? N how did it go?

I was walking down the hallways of campus just as I was about to turn a corner I pass this girl with the most creative hairstyle I've ever seen I didn't even mean to say it out loud but it just happened I told her "you have one of the best hairstyles I've seen today" I got a smile and a thanks and that was enough for me.