But Chris Mike, director of marketing and advertising for Nike Golf, said he immediately saw the moment's potential for another cause: the marketing of Tiger's prototype Nike One Platinum golf ball, which had just made the miraculous journey. Mike said his team began work Monday on commercials for One Platinum, which most likely will include Tiger's shot, and could start running as early as next week.

The twist? Joseph Jaffe, marketing blogger and president of the "new marketing" consultancy "jaffe, L.L.C.," beat Nike's marketing team to the punch on Sunday by uploading Tiger's moment on the 16th green from his TiVo to his personal computer, adding Nike's "Just Do It" slogan at the end of the shot, and posting the sequence in 30- and 60-second form to his blog that same night.

Since Monday, Jaffe's site, jaffejuice.com, has received over 50,000 hits, in large part because established public relations blogger Steve Rubel chose to link to Jaffe's blog. "I'm very interested in people creating their own ads," said Rubel, who is also vice president of client services at CooperKatz. "Jaffe's ad wasn't innovative because of the creative design, which was pretty straightforward. What was innovative about the ad was the consumer initiative that it represents."

Jaffe said he never set out to wow people with his design skills. "The thing took less than half an hour to put together," Jaffe said. "I didn't do this as a designer; it was an experiment to test the powers of viral marketing. It's all part of my belief that the only way to revive the relationship between consumers and marketers today is to throw the rules and the roles we play out the window. This just proves how easy it is for consumers to have a voice."

Many experts who track the growth of viral marketing--also known as word-of-mouth marketing--portray the phenomenon as the inevitable outgrowth of accessible graphic design tools and consumers' desire to help define the brands around them. "Thanks to applications like iMovie, content is so easy to make now, and we see this all the time now from consumers," said Pete Blackshaw, chief marketing officer at Intelliseek--which measures consumer sentiment and buzz online--and co-founder of the Word of Mouth Marketing Association.

Blackshaw cited two pieces of consumer-generated media, each inspired by Apple's iPod, to illustrate the unpredictable nature of consumer control. In one well-known instance, a schoolteacher by the name of George Masters spent about five months creating a professional-quality iPod ad that has been widely distributed around the Web. In another case, two brothers and professional filmmakers named Casey and Van Neistat took a different tone after Apple allegedly wouldn't replace Casey's iPod battery when it died on him. They filmed each other spray-painting the words "IPOD'S UNREPLACEABLE BATTERY LASTS ONLY 18 MONTHS" on as many public iPod advertisements as they could find and then posted the video at iPodsdirtysecret.com.

Other established brands--Ford, Puma, Volkswagen--have been the victim of viral efforts by consumers who haven't depicted the brand's image nearly as well as Jaffe portrayed Nike. "This was really a dream scenario from a marketing perspective for Nike," said Jonathan Carson, president and CEO of BuzzMetrics, a research firm created to mine conversations that consumers have with one another online. "Companies run the risk of backlash when they immediately swoop in on powerful, natural events, and try to exploit them for their own gain. In this case a consumer took the initiative, which takes the weight off their shoulders."

Jaffe found it surprising that consumers went to his business-to-business site to post comments about his ad. "It's really an industry site where you wouldn't normally expect consumers to tread," Jaffe said. "They're playing in our sandbox, which is great, because it's just another example of consumer/marketer roles being disregarded and consumers using the voice they've been given."

Nike's Mike said he had not seen Jaffe's ad, nor would he comment more broadly on consumer-generated media.

Steve Rubel said he thought it would be a mistake for Nike to force the ad's removal. "No public action is really the best plan of action for Nike in this case," said Steve Rubel. "Unfortunately, they don't have a blog where they can post this, but they should at least send it to their ad agency." Added Rubel: "This type of feedback is truly invaluable."

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