I had a good friend sternly tell me about two years ago that I needed to learn to laugh at myself. Not only did I take his advice and go to school to learn how to laugh at myself, but I began to notice others who recieved this education as well.
It is cathartic to make a mistake and then look back with others and laugh at what you may have done wrong. It also gets everyone else's mind off of it as well.
If you laugh, people will laugh and then go on with life. If you refuse to laugh, people will never stop laughting!