Has someone let you cut in front of them in traffic or go first? Have you tried to wave "thank you" to them but doubt they actually saw you wave? Then you may want to get yourself a Wiper Wave! This genius invention attaches to your rear window wiper and you can go ahead and make sure that nice guy behind you sees your thank you wave! Only $12.99 at The Wiper Wave. Comes in white, red and blue.