Bitcoin is like Blade, the vampire/human hybrid who slays vampires.
Bitcoin is similar to a hybrid between gold and credit cards. It has most of the strengths of both, with none of their weaknesses.
An example of this is bitcoin having more intrinsic value than a credit card due to it being deflationary and algorithmically printed. This guarantees responsible and ethical production of funds which cannot be hyperinflated. This form of intrinsic value represent traits historically associated with gold.
On the opposite end of the spectrum, bitcoin can conduct electronic transactions via point and click operations similar to credit cards. This ease of use and convenience represents traits historically associated with wire transfers and credit cards.
Bitcoin thus represents the best of both worlds with very few if any of their limitations. It has the intrinsic value of gold without the physical constraints or difficulties of storing gold or using it to conduct transactions. And the speed and convenient user experience of credit cards without their lack of intrinsic value.
Anyways, I was trying to think of a way of communicating bitcoin's features within a decent marketing framework that would allow it to connect better with the general public. And this silly idea is the best I could come up with.