Jim Feeley suggests ways to make your own viral hit in his Wired article,
Wired 14.05: Lights! Camera! Vodcast!. In his section on shooting, he suggests some of the following:
Choose your weapon: For Internet video, use a miniDV cam that captures 720 x 480-pixel footage.
Record clear audio: The built-in mike on your videocam is too far from the action.
Keep it steady: If you have to shoot handheld, lean against a wall or tree to stabilize yourself.
Film multiple takes: Rehearse, rewrite, and redo. Shoot each scene several times and from different angles.
Edit edit edit: Use free programs like iMovie or Windows Movie Maker to splice the best takes into a final video."
Well, you could do it that way, or you could do it this way. (My Suggestions):
Choose your weapon: Use a regular still camera that also shoots video at 320x240.
Record clear audio: Hold the camera close to your subject so that the inbuilt camera catches the audio cleanly.
Keep it steady: When shooting handheld, just keep your hand steady.
Film one take: Shoot one take of a moment that you want to capture.
Don't Edit: Post what you've just shot as it is. Capturing fleeting moments that would have otherwise been lost is a treasure.
Get out there and have fun and don't worry about being the next Steven Speilberg.