When the Fed starts printing new money I'm going to miss this tip trick. I've been doing it for almost 40 years since I was in the Marines. It's great in places like bars. The server knows you tip and keeps an eye on you. Especially since I'm 5'3 because I broke my back in the Marines. Used to be the minimum requirement 5'4 lol. They always come to me when I get to the bar because they remember me no matter how busy.