In 2012, Nike (which is not an Olympic sponsor) launched its "Find your Greatness" campaign that featured amateur sportsmen around the world (in places like Jamaica, Ohio, Qatar, Nigeria, and Norway).
This made the IOC mad as it was yet another example of Nike's clever strategy that just fell short of ambush marketing.
What was in the campaign that slyly associated itself with the Olympics without overtly saying so?
From my Mood Indigo quiz at IIT Bombay, 2012
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All the places were called "London" (such as London, Ohio or London, South Africa) or associated with the word "London" (like a centre named "London").
More reading.
This day last year: Q.482