With everyone switching to digital, this has left a ton of old film cameras available to modify and do interesting things with. The most obvious thing for cameras with a built-in flash is reusing them as a one-shot strobe for annoying your friends or pretending to take peoples' pictures or for a play camera for the kids. A lot of times though, the camera won't wind up without an actual roll of film in it. This is easily bypassed though as shown in the video by adding a switch in place of the shutter. Then you can make it flash simply by pushing a button.