Flipkart has created a line of sequel to their existing campaign with kids playing the "elder" role. The biggest winner here is the insight they have based their campaign on - "people find it difficult to buy online." They dug deep enough to understand that the basic concern of their business is not in the sale of books, but in the medium of selling. People prefer buying from a brick and mortar store and this issue can be addressed by relating the concern with the previous generation. Also, the reverse roles between generation X & Y is a huge interest factor that makes this ad channel-surf proof.
Simplicity of communicating the concept makes this campaign a true winner. Not many ideas have scope for developing sequels, but this thought is powerful enough to be extended.