Unfortunately, there is usually a large stumbling blog that prevents you from doing all of this: the introduction. That’s right—before you can get into the meat of the presentation or speech, you have to wake your audience up, tell them what you’re going to talk about, and give them reasons to be interested. And your introduction is the tool you will use to accomplish this.
Now, one way in which you can instrumentalize your introduction to achieve this end is to use it to tease some of the more important findings or things that you will include in the rest of the speech. For instance, if it is a wedding speech, you might say that you’re going to reveal something about the groom that no one else knows—including the bride.
Alternatively, if you’re doing an academic presentation, you might consider teasing some of the important findings from your work. For instance, you might simply say “I found X,Y, and Z” in your introduction. You might think that it gives away too much too early, but in fact, it will focus your audience on the right idea—and will give them motivation to retain the rest of the information.
Source of Information : Public Speaking Exposed