Just moments ago I made a mistake in a headline (it's fixed now). I'm the son of a Latin teacher. And I worked many years for an editor who would pounce on even the tiniest mistake.
So, I have special reasons for noting that:
It's National Grammar Day.
There's lots of chatter about it on Twitter.
Fellow journalists: Be nice to a copy editor (if there's still one around at your office) today.
And here's a widget full of grammar tips: