I've posted before that unnecessary and misused quotation marks bother me. Seth Godin points out that, unfortunately, it makes you look stupid (no Seth you are not the only one who gets that impression). You are probably not stupid, of course, but because you didn't take the time to appropriately use apostrophes and quotation marks, you appear that way, and people will write you off. Again, it's very unfortunate, but it's how things are.
Anyway, I think this sign takes the cake for quotation-mark-and-apostrophe unnecessariness, in that absolutely none of them should have been used in this sign at all.