Hiltl in Zurich is according to the Guinness Book of World Records the world's oldest vegetarian restaurant. It was established in 1898 founded by Ambrosius Hiltl and is now run by the fourth generation of Hiltl. Now the advertising agency was Ruf Lanz commissioned for an advertising campaign. What came out here, reads the slogan: „Deep Down We’re All Vegetarians“.
(via Ads of the World)