Digital cameras and video phones are ubiquitous today; people from every walk of life can now take videos just anytime, anywhere and whenever they like it. many people are also becoming good at it. These videos they make often become popular for a short time and they get passed around from mobile phone to mobile phone, or via email, or better yet via Youtube. According to Wikipedia a viral video is a video clip that gains widespread popularity through the process of Internet sharing, typically through email or Instant messaging, blogs and other media sharing websites. Viral videos are often humorous in nature and include televised comedy sketches.
And don't you know that there's a website that is solely dedicated to charting viral videos? It's ViralVideoChart.com. The video above is an example of a viral video, actually it is at present the top viral video in the chart.