A mars a day helps you work rest and play.....

I Just read on the BBC news web site that Mars are cutting 700 jobs from UK workforce to move them abroad. New slogan time.

A MARS A DAY KEEPS FOREIGN WORKERS IN PAY!

concerning this phrase.. it was actually invented by Murray Walker the famous formula 1 commentator when he worked in advertising, pretty sweet eh

I think someone should write a book about all the slogans, commercials, etc., and their origins.

Murray Walker DIDN'T write the slogan, he was the account manager on the Mars account at the time, but not the creative. The matter is dealt with in his autobiography.