If you want to understand how to create a viral video, check out these viral videos. Watch them, absorb their secrets, and copy what they do (or, better yet, hitch your wagon to one of these stars!).
It’s hard, for example, to set the stage for an animal video to work, but it is possible to build upon an existing animal video to get across your own message. For example, check out the video for Maru and the Small Box. That video could be the basis for a video about not letting others stick you into a box.