Specify the location of a joke or story. If your story takes place in a restaurant say, "I was at Jerry's Sub Shop in Rockville, Maryland, the other day." This gives the audience something concrete to think about, which makes them more involved mentally.
When crafting a story, use people, places, and things the audience knows. When the audience is familiar with the elements in your story, they will become even more involved. As soon as you mention the company cafeteria, their minds race to the cafeteria to meet you and find out what happens. However, don't use humor that is too inside. Only a few people will understand it.
Emphasize the adjectives and verbs in your stories to make them sound more interesting. Try it. Look around where you are right now and describe anything you want. Really put punch behind the adjectives and verbs and see how your description comes to life.
Use specific and interesting verbs and adjectives. Say I was exhausted, not I was tired. Say, her head was nodding and drooping, not her head was down.
Learn your stories. In a normal speech if you forget the exact thing you wanted to say, you can improvise and go on. But if you leave out an important detail in a story or if you accidentally give away the climax too soon, you have a mess on your hands. I tell a story at least 30 times in private before I'll test it in front of an audience.
Use true facts from your own life. This makes it easier for you to tell the story because you lived it and you can learn it faster too. Also, someone else can't steal your story as easily if all the facts have to do with your life.
20 years of speaking tips... all in one book!