Advertisements, if they want to work, need to be clever, noticeable and easy to remember. To be noticeable and easy to remember, one way is to put some fancy graphics or photo in it. Another is to use a clever slogan that catches your attention.
Australia's Motor Accident Commision of South Australia (MAC), using the Clemenger BBDO PR agency, came up with a nice advertisement campaign to prevent people from letting their buddies drink & drive. The ads are targeted directly towards car drivers, but also apply to motorcycle riders.
The ads used an interesting graphical interpretation of some local slang words.... I've put a link to the slang word's explanation in case the word means nothing to you...
KnobKnob is English slang for penis, but often is used to describe a person, i.e., a dickhead.
Apart from the ads and billboards, the Commission also produced a series of beer coasters:
Via: Ads of the World