It might as well just be a huge middle finger to everyone else on the road.
We love Porsches here at CarBuzz. Some of us more than others, but we generally agree that they are very desirable cars. Porsche owners, on the other hand, are not always so enjoyable to be around, and many of them have seriously appalling ego problems (not all, of course, many are lovely people). Not helping with this particularly is a new interactive billboard going up in Australia which can pick out Porsches with a camera and display a special message just for them.
After the Porsche passes, the sign reverts to its normal dull message for all of the miserable peasants in their crapwagons.