First read the cartoon Candorville: Scare Quotes.
What are “scare quotes?” you ask. They’re the quotation marks people use to call attention to a word or phrase. Unfortunately, 99 times out of 100 they’re misused, causing the writer to look foolish or worse (stupid) or causing the message to become funny rather than achieve its probably serious intent. For some laughs, visit these sites, whose collections of misused quotation marks are just a few great examples of unintentional grammatical humor: