This quote means that if you want to make your audience laugh, the best way to do that is to start laughing yourself. This can encourage the audience to laugh along with you, creating a fun and enjoyable atmosphere. Laughter can create an atmosphere of joy and happiness and can be a great way to connect with an audience. Additionally, if you start laughing, it can help to set the tone for the rest of your presentation, as your audience will know that you are open to having a good time.