Note: Some makers have commented that this particular project should not be attempted unless you know exactly what you are doing and have taken the right precautions.
bbum’s found a cool way to get a photo with lots of sparks:
* Take a part a disposable camera, desolder the capacitor and rig up a charging circuit.
* Charge the capacitor
* Turn off the lights
* Set your digital camera on a 5 second exposure*
* Use a bit of metal to discharge capacitor at the focal point of the camera
* Upload photo to flickr
‘Cause splosions are cool – Link