So the ONE day that I write about Gardasil on this blog (see directly below this one), I get offered the drug at the doctor's office. I responded by telling my doctor how much I didn't like the grammatical incorrectness of Gardasil's ads (as if that had anything to do with how well the drug worked). She had never thought about "one less" being incorrect, but, she told me, Apple's "think different" ad campaign really got on her nerves.

It took me a second to understand that it's supposed to be "think differently." I guess we all have our mental blocks.

But "think different" could be correct, in the same way that "think France", "think tutus", or think roses" is alright. "Different" as an independent concept, rather than a modifier of "thinking."