Among the pop-culture viral videos I apparently missed is Matt Harding‘s dancing. I had to turn to Wikipedia for an explanation:
Harding was known for a particular dance, and while videotaping each other in Vietnam, his traveling companion suggested he add the dance. The videos were uploaded to his website for friends and family to enjoy. Later, Harding edited together 15 dance scenes, all with him center frame, with the background music “Sweet Lullaby.”
The video was passed around by e-mail and eventually became “viral”, with his server getting 20,000 or more hits a day as it was discovered, generally country by country due to language barriers, before the launch of major video upload sites.