Burn in power cord by boiling water??

A Hi-Fi dealer the other day told me that in order to burn in and smoothen out a new power cord, I should get my wife to use it on the kettle to boil water (Rather sexist remark, I know). The theory is that kettles draw a lot more current than hi-fi equipment. He further advised not to do it more than 3 times.

Just a bit worried that the wife might not want to return the power cord after she discovers that her coffee tastes a lot better by using it.

Any opinions on this?