One time when I set out to do some light drawing/ painting photography I forgot my cable shutter release so I had to ask my sister to hold down the shutter button (needed the camera in bulb mode) while I did all the light art for the shot (It was impossible to do both without the cable shutter-release) and just told her when it was time to release the shutter. I still consider the photos taken that night,my photos although I did not physically press the shutter button, I set the camera settings, set-up the tripod and did all the light-painting in the shot, in fact my sister wouldn't have had a clue as to camera settings etc., but do give her credit for helping to take the shots, without her help, I'd have been unable to use the Bulb-setting and been limited to 30secs per shot.