You can’t make a viral video, ad, or idea.
You can make a great video, ad, or idea. If a gazillion people share it, then it went viral.
Viral is the result: It’s what happens when people love your stuff so much that they share it with everyone.
(Run away if someone tells you that they can make you a viral ad. They can’t. No agency has the magic formula. Pay attention if they tell you that they can create a lot of great content and distribute it smartly to the right people, hoping it will go viral.)
Here’s a video interview with Ze Frank on the topic: