The cool thing is that if you do this enough times it will actually become a habit. I have seen many speakers speaking on this topic and it is always a fun topic to watch speakers demonstrate. I even heard one speaker say that it is physically impossible for an angry person to smile and stay angry. I love some of the examples they give. One involves standing in front of the mirror and while looking at yourself smiling the biggest possible smile you can create. The technique works thank you for sharing it. It has helped me a lot in my life especially because I work in a very stressful industry. People are always commenting on my positive attitude though I honestly no I fail more times than I succeed.