The campaign, created by digital agency Lean Mean Fighting Machine, allowed them to take over the Facebook status box of users who agreed to take part. And proved a massive success.
However, the promotion backfired when a Mum saw her 14-year-old daughter's Facebook page – or rather the Dr Pepper campaign she had joined – had been updated with a message that made direct reference to a hardcore pornographic film.
So Coca-Cola is now reviewing its relationship with the agency - telling them to stop advertising work on all their brands - despite the fact that they signed off the offending remark. Coca-Cola say they didn't realise its true meaning.
So who's to blame - agency or client?
Update: Since this post, Coca-Cola and Lean Mean Fighting Machine have mutually agreed to part company.