A little off-topic but I think the technology used could open up a bunch of other advertising ideas
Playboy has an ad in Dusseldorf Germany that asks male readers to "Pray for rain".
The billboard changes when water hits the image. A harmless image but I thought it would be best to have readers click on the image to see the before and after.
If you can't figure out what Playboy and water could do with advertising, click here
After you do, tell me if I should put the image on the post.