While technically not a syntax faux pas, this sign on a construction firm's office door made me smile. [Note the lace curtains!]
Syntax Schmintax is an attempt to document, and make myself more aware of, the grammatical errors being made in advertising and marketing by organisations who in the main employ professional sign-writers and printers. It is by no means an authoritative reference, and is only my personal opinion. Feel free to chime in and comment, especially if you are one who has an English honours degree (which I don't)!