Two sets of photos:
1. Take a set of photos of three objects. A foreground, middle ground, and background. Set the camera up on tripod. Take an image at your longest, shortest, and middle of the road focal lengths. Don't move the camera at all between the shots. Use the same exposure for all the shots.
This image illustrates the idea of what you are trying to do.
Another example.
2. Select a subject. Take an image at your longest, shortest, and middle of the road focal lengths. Move the camera as necessary to keep the foreground subject the same size. A friend works well as a subject. Note how the apparent distance between foreground and background elements seems to change.Use the same exposure for all the shots.
Here is a nice example of what you are trying to do.
Here is another nice example of what you are trying to do.
Here is yet another example.
Other links you might find useful/interesting:
Effect of focal length and DoF
Illustration of the effect of changed perspective in combination with change in focal length
Series of portraits taken using different focal lengths and perspectives.
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