Harrod Blank had a dream in which he covered his car with cameras, then drove around town to take pictures of people on the streets. Two years later, with help of his friends, Harrod completed the Camera Van (complete with working cameras!):

Wanting to impress even people in airplanes and from the tops of buildings and bridges, Harrod wrote "Smile" in Kodak Instamatic Cameras on top of the van. When he showed his mother the roof, she just shook her head and smiled, "You are really...obsessed!"

Link (Don't miss: photos of perplexed and astonished people looking at the van, Harrod's Flash Suit)