The definition of Viral Video is kind of like the definition of Porn – you can’t exactly define it but you know it when you see it. If you are trying to create a viral video, the odds are against you. In general, it needs to be fun, fascinating, sticky, inspirational, different (the same thing but different), contagious, etc.
A local group at a hospital put together this video to generate breast cancer awareness throughout their hospital system. Apparently, they had a ton of fun putting this together and hope that it inspires others to join in the cause.