SPAM. First marketed by Hormel in 1937, it rose to fame thanks to relentless advertising from the very beginning - and being a non-rationed food during World War II certainly didn't hurt. George Burns and Gracie Allen were featured in a lot of 1940's and 1950's SPAM ads.

"SPAM 'n' eggs go great together!"     /      "So do SPAM 'n' waffles 'n' me!"          /          Whoa. Say goodnight, Gracie.