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As said above, sometimes you have to break a few rules for clarity. You don't want to be 100% grammatically correct, but lose the customer as they're focusing on one word that looks odd rather than the overall message.

"Think Different" is arguably incorrect too, could be Think Differently, or Think of "Different". But neither of those has the same impact.
 
Working a bit in advertising, having things grammatically and syntactically correct language is very important. But what's more important is using language people understand - and we see it all over. All you have to do is just think a little... different.
 

Are you being serious? He spelled it as "It's" in his post.

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Okay so who prefers the curvy, cool-looking apostrophe (the kind you get when you use smart quotes) over the stock, regular, boring-looking, never-looks-like-it-belongs-in-the-word, angled apostrophe? Ooo! Ooo! I do! Me! Me! :)
 
I am now pretty convinced that it is wrong as an apostrophe (') denotes belonging or a missing letter, in which 'no' does not have, it is plural.

The plural of no is noes. According to the above rule - remove the 'e' and replace with apostrophe then it becomes no's.

You'd answered your own question, if only you'd realised it.
 
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