In my view, you are not only short-changing the audience if you begin with irrelevant detail, but you are also running the risk of losing their interest before you have told them what the speech is about. There are many ways that you can begin a speech with relevant material while keeping the audience engaged. You can make a promise to help them overcome business issues that we all share. You can pose a tricky question that makes them think, and explain how you will show them the answer. You can use humour as long as it is relevant.
In short, your speech opening should:
- Set the tone for the rest of the speech
- Engage the interest of the audience
- Make a promise
- Establish a common interest between you and them
- Move smoothly into the body of the speech