Global warming is more on our radars than ever, and with this billboard in Germany, it seems everybody is praying for rain. While the ad is a bit old (it dates back to 2005), it's worth refeaturing.
When the interactive Playboy billboard in Germany comes in contact with water, due to bad weather, the woman's white-shirt becomes see through. This is definitely a risque marketing strategy, it certainly speaks to the target demographic that Playboy is intuitively after.
Implications - It would be interesting to see if a billboard this risque generates any kind of significant controversy in the local community. Needless to say, however, fans of Playboy will certainly find little to complain about.