One of the hardest things to do is try to sell a product along with a purchase, which is why so many companies know the value of selling the right thing to create that next viral sensation. If created with the consumer in mind, there is no limitation to the amount of buzz your product can create. I have had a very intimate relationship with companies that want to spend more to engage more and create touch points no one else can.

Cars Translator
BK Tiki Cups
Second Life
Powerade Bottle
Coca-cola headphones