"My favorite bumper sticker I’ve never seen: Commas matter."

Washington Post columnist Kathleen Parker makes a case for using commas correctly.

It matters because good grammar conveys a great deal about a person.

Quality is in the details — and attention to commas, semicolons, dangling participles, gerunds and the proper placement of quotation marks says to the reader that this person is careful, considerate (because bad grammar is painful to the discerning eye), and (there’s that Oxford comma) competent.