I think you're referring to Casa Sanchez here in SF.
$5.8 Million Tattoo / Sanchez family counts the cost of lunch offer - SFGate
Many people have ridden the corn rocket. So many, in fact, that they stopped the promotion. But in searching for the above link, I found that they brought it back in 2010 as part of a "stimulus" package.
It's not a bad logo as a tattoo, I gotta say. Believe it or not, I've never actually eaten there, but I have easily consumed my weight in their chips and salsa, included the last part of a bag of Casa Sanchez chips just yesterday.