The Fulgurator is essentially a slave flash (it uses a photosensitive cell to trigger the flash when another camera’s flash is activated; it’s very simple, feels a little magical and I’ve got several I use in studio shoots) that projects an image onto any surface you want when someone else takes a picture — basically hijacking their photograph and inserting any invisible message or pictogram into the image. Which works particularly well to trick tourists, as they tend to use their flash for everything when they shouldn’t.

The video is too long, but you’ve got to watch it until the end; it is fucking awesome.

P.S. The Brains Behind the Image Fulgurator.

via notcot.org