Viral Videos Re-Done

Not only are viral videos popular but they inspire people to copy them or remix them. There are several videos posted on YouTube that have people of all ages mimicking Charlie Bit My Finger. They are followed along with several videos that remix the video into something musical or even more comical. I want to know what makes people want to copy these videos. Do they copy these videos or remix these videos simply because they are popular? What makes the videos so cool that people would want to copy it? I think these questions bring me back to my main idea of what is a viral video and how do videos go viral? I hope by looking at this reproductions of Charlie Bit My Finger that I will get some insight into why these videos became viral in the first place. Does the reproduction such as a copy or remix of a "viral" video really what makes it viral, or is it simply considered a viral video based on the amount of views it receives?