The first time I did this, I was having a really bad day. So on my way out of the library at college, I decided to leave notes on a couple cars: “Have a wonderful day!” and, “Enjoy your weekend!”. Now I do this whenever I think about it. The hardest place I found was the WalMart parking lot. There are people EVERYWHERE! (And of course, I always try to do it when nobody’s looking!) =0)