He brought the knife back to the place that it was "sharpened". He got $3.00 back for the sharpening, and was told they had never had a complaint before. He asked the guy how he would sharpen his own serrated knife and was told that he would have sent it in to the factory. (In this case, Cutco). When asked why they ground his knife down, he was told because he requested that they sharpen it.
I've encouraged him to go to small claims court.