Todd Wasserman sums up the impetus for Norton’s clever metaphor in this spot when he points out the challenge in visualizing software in TV ads. For Norton’s ad it starts with casting UFC fighter and King of the Web Brawlers Kimbo Slice to represent a cyber-criminal. Then they portray a caterpillar to represent user identity. It gets more surreal from there.
Check out the TV spot, and read Wasserman try to make sense of it all, at BrandFreak.