How to do a 'ghost photo'?

If you have Canon 400D you should see the image, otherwise read the text.

I know that example image isn't very great... ,but it's good enough for teaching. Now this is how you do it:

1. You need a camera that lets you choose the exposure. (Usually only SLR cameras have that ability, but some hybrid and normal digital cameras have it too)

2. First you, of course, pick a target and the thing (or person) that (or who) you want to turn into a "ghost".

3. Now select some really long exposure time (as long as you can, but notice the different lightnings). In this image I used 30 second exposure time.

4. Select in the camera that it flashes in the beginning of the exposure, BUT NOT IN THE END!

5. Start the exposure without the thing (or person) that (or who) you're going to turn into "ghost" in the image and immediatly after the flash put the target into the image. Notice that longer the exposure time is the more visible the target comes, so you can use shorter exposure time or put the target into the photo later.

6. The image is ready.

PS. Please or comment if you used this tutorial.