Sarah Kiedron looks through a hole in a letter being auctioned off in 2013 in Edinburgh, Scotland. Friday is National Grammar Day. Getty Images

Friday is National Grammar Day, an unofficial annual celebration of language and good writing. Teachers, students, authors and editors observe the holiday every March 4 in the United States.

It's a good-natured observance where people share tips about how to improve grammar and jokes about those who struggle. Even the date itself is a grammar joke. "It’s an imperative: March forth on March 4 to speak well, write well and help others do the same," according to the Examiner.

Writing Forward suggests spending your National Grammar Day by looking up grammar tips, browsing themed e-cards or checking out some famous typos.

"It should be a lighthearted day of exploring and learning," Mignon Fogarty, who wrote "Grammar Girl's Quick and Dirty Tips for Better Writing," told the Chicago Tribune in 2012. "It's a day to get everyone thinking about language and all its quirks and frustrations and fascinations."

On National Grammar Day 2016, check out a few of the internet's best language jokes, collected from Grammarly, GoodReads and Alpha Dictionary, the last of which includes phrases from Paul Ogden, Doris Britt and Reba Prater:

What’s another name for Santa’s elves? Subordinate Clauses.

To write with a broken pencil is pointless.

I tried to catch some fog. I mist.

“The rule is: Don’t use commas like a stupid person. I mean it.” ― Lynne Truss

A bicycle can't stand alone; it is two tired.

What do you call a dinosaur with an extensive vocabulary? A thesaurus.

“It's hard to take someone seriously when they leave you a note saying, 'Your ugly.' My ugly what? The idiot didn't even know the difference between your and you're.” ― Cara Lynn Shultz

A will is a dead giveaway.

“A synonym is a word you use when you can't spell the other one.” ― Baltasar Gracián

Sea captains don't like crew cuts.

Knock, knock.
(Who's there?)
(To who?)
To whom.

Two quotation marks "walk into" a bar.

Every time you make a typo, the errorists win.

What do you say when comforting a crying grammar fan? There, their, they’re.