I just came across 2 articles which I think sum up what goes into making a successful viral video
Here are 8 tips to make your YouTube video go viral by David Meerman Scott...
Tip # 1 – Homemade is just fine. You don’t need to hire a professional.
Tip #2 –Your video should be no longer then 2 minutes (preferably less). Think very short.
Tip #3 -- Make your description clear and specific. Use descriptive keywords that people will search.
Tip # 4 -- Don't attempt "stealth" fake customer insertions to YouTube. The YouTube community is remarkably skilled at ratting out inauthentic video.
Tip #5 – Try a series of similar videos to build interest. Sometimes a series of videos works great.
Tip #6 – Tell everyone about your video! It takes time to build an audience.
Tip # 7 – Make sure bloggers know about the video. Sending a link to the video to bloggers or commenting on other people's blogs.
Tip #8 – Experiment a lot to find something that hits. Try a number of things in order to get that elusive hit.
Then here are Ten Viral Marketing Best Practices by Bill Sweetman...
#1 . Think high concept: The viral ‘thing,’ whatever shape or form it takes, has to be highly provocative in some way.
#2. Work backwards from the headline: Think about what the headline of the blog entry.
#3. Keep it simple: You have to hook people fast.
#4. Humour Sells: Nothing says viral better than a good belly laugh.
#5. Sex Sells: But that’s way too easy.
#6. Big Names Sell: A viral marketing concept that leverages a well-known person.
#7. Topicality Sells: A viral marketing concept that is ‘torn from today’s headlines’ can have a leg up.
#8. Don’t Try Too Hard: If you ask, or beg, for viral pass-along status, chances are people will see right through you.
#9. Reality Sells: What often works best in the viral space is unvarnished content by real people, or at least made to look that way.
#10. Mystery Sells: Everyone loves a good mystery.
Ok, there you have the 18 essential ingredients to making a successful viral video. Have you made yours? Here's the instant way to do it... http://www.instantviralvideo.com/
Here's one viral video that used most of the ingredients... Enjoy!
Unleash your Viral Video Now... http://www.instantviralvideo.com/