It is well-known that ghosts haunt the places they died, like a holiday-maker obsessed with the airport.
Create a ghost photo *with you in it* by using this lethal injection shutter button technology on a polaroid-type camera. Take your final selfie in a mirror, die, and leave the camera to someone in your Will. They may be someone you know is a candidate for euthanasia, a convicted criminal on Death Row, or simply someone with a keen interest in paranormal photography.
If every subsequent user follows the correct method with the mirror, then each photo should contain, in the polaroid, the polaroid of the previous deceased, their ghostly image, and all the ghostly images of the previous user of the device.