Build me one of them there viral videos you make...

Just because you want it to be viral, doesn't mean it will be. Viral marketing is something that can not be manufactured. Viral marketing sometimes fails. Viral marketing is a learning experience that can contain amazing surprises.

To build a viral campaign you have to pass certain tests with your audience.

Is it engaging?
Is it authentic?
Is it different (not necessarily unique - but different)
Is it worth sharing?
Is it entertaining or does it evoke an emotion?
Will it influence a decision?

And you can't just ask yourself. I think I make a damn fine baked chicken. My daughter, however, takes one bite and pretends to vomit in her milk. You are not your target market. After all, you already have your own product or service.

So before you ask for a viral video - ask yourself what your intentions are. To make money? That might not be the right motivation. To share the world's best idea/product/service with people who will think it's amazing? There ya go.