Niagara Falls, Ontario's Nightmares Fear Factory has a Flickr feed full of visitors being terrorized in its environs. Interesting to note the emotional response (and a few ones that do not) facing a understood false danger, suspension of disbelief in action.
Japanese warning signs are very different than warning signs in other parts of the world, because they usually contain a visual and easy to understand reason why something is dangerous or not allowed.
Anat Levin, Dani Lischinski, Yair Weiss - a computer-assisted process of adding color to a monochrome image or movie with a relatively modest amount of user input.