Is This The Best Advertising Plan Ever? [VIDEO]

Nowadays it is getting to the point where you need to be on the internet to exist. However shipping company DHL may have just found one the best ways to have their name out there. What better way to advertise then have your competition do it for you.

That's right DHL had black boxes that courier's from UPS, TNT and FedEx pick up. These black boxes would begin to change colors as the package got warmer in the back of the trucks. Once the boxes warmed up enough the message 'DHL Is Faster' would appear for everyone to see.

Is this the one of the greatest marketing strategies ever or what?