Resubmitted campaigns win Cannes Lions in 2010
Cannes Lions submission rule no. 5: "Advertisements must not have been entered in Press Lions in the Festival in previous years". In reality not everyone respects this rule.
First Ogilvy Mexico's Scrabble campaign shown below was submitted and has not even received a short-list in 2009. In 2010 it wins a Grand Prix. Since it has been withdrawn.
Second, ALMAPBBDO's Havaianas campaign shortlisted in 2009 gets resubmitted in 2010 and wins a Press Bronze.
Screenshoot of the shortlist in 2009:
Screenshoot of the win in 2010:
Third, Leo Burnett Canada gets a shortlist in 2009 for P&G's Cheer Dark brand and wins a Press Bronze in 2010.
You can check out this campaign on AotW as well:
Adage and Adme.ru spotted these.