Pringles.
Wow. You can stack them. 

Admit it, after decades of eating Pringles you never thought to stack different flavors to create new ones. But once you hear of it, it's the kind of thing that makes you dumbfoundedly say, "Wow." This tiny insight was the birth of an entire Superbowl campaign that still continues to appear every year.

WowYouCanStackPringles.com

We took expanded the campaign into an interactive stacking tutorial where you could be "wowed" by your own flavor stacks.  On average, people spent a shocking eight minutes on the site stacking different flavors to be wowed by them. Below is a site demo and all the "wows" you could receive at WowYouCanStackPringles.com.