Ghost Photo is a fun practical joke for iPhone and iPod Touch owners. Choose any photo from your photo library, press Start, and ask a friend to check out the photo. Watch them jump when a ghost suddenly appears on the screen a few seconds later. Crank up the volume for maximum effect.

For a more nuanced version of this joke, activate the Extra Delay option which causes the ghost to appear after 35 seconds. Then tell a friend that a ghost was captured in the picture and ask if they can see it. When setting up the joke, be sure to

1. Tell your friend that the ghost only shows up if they remain focused and still.
2. Tell them to be patient, as it can take up to a minute for their eyes to adjust.
3. Let them hold your iPhone or iPod Touch after you've finished the setup.

The 35 second delay assumes about 15 seconds of set up and 20 seconds of your friend staring at the photo. They will jump out of their skin when the ghost finally does appear.

Enjoy!