A cartoon about grammar
And no, the joke is not that those are really shamrocks on her grave. I saw this in the comic Rubes, by Leigh Rubin. The link to his comics is here: http://www.creators.com/comics/rubes.html, and I recommend subscribing to the RSS feed. Here’s a link to his bio: http://www.creators.com/comics/rubes-about.html.
Thank you. I love grammar jokes, and I love complaining about obvious infractions on television and in advertising.