As an editor, I'm always on the lookout for inappropriate use of quotation marks (or "inverted commas" as my British co-workers call them).
So I was thrilled to discover this Web site — thanks to BuboBlog West Philadelphia correspondent Guy.
When I was in college, we tried to throw a party with free beer. (At the time, people usually charged $2.) The guy who did the invitation decided to put "free beer" in quotation marks. That suggested to others that perhaps the beer wasn't in fact free, but would be offered in exchange for something else. Controversy ensued! (It didn't help that there were some very inappropriate drawings on the invite as well.)
Anyway, watch those quotation marks!