There’s a no-fail, quick, and easy way to annoy everyone in your life—even your mom. All you have to do is make spelling and grammar errors, and you’re guaranteed to get people’s skin crawling.

But not knowing the difference between “your” and “you’re” or “who” and “whom” isn’t just aggravating: It also destroys your credibility. After all, who trusts a man or woman who hasn’t mastered something that was taught in elementary school?

This infographic lists the most annoying spelling and grammar errors, so you can keep your emails, memos, and reputation safe.

Infographic courtesy of Ragan. Photo of eraser courtesy of Shutterstock.