How to Use Humor in Email Subject Lines (Without Sounding Unprofessional)

The Inbox is Boring. Be the Exception.

Scan your inbox right now. Most of the subject lines are dry, functional, and frankly, a little boring.

"Weekly Newsletter Vol. 45" "Your Invoice is Ready" "New Product Announcement"

In a sea of corporate jargon, humor is a life raft. A funny, unexpected subject line disrupts the pattern, grabs attention, and builds an immediate connection with the reader.

But humor is also subjective. What's hilarious to one person might be offensive to another. Here's how to navigate the tricky waters of being funny in email marketing.

Why Humor Works (When It Works)

1. It Humanizes Your Brand: It shows there's a real person behind the screen, not just an automated marketing machine.
2. It Triggers Emotion: Laughter is a positive emotional response. If you can make someone smile before they even open the email, they are already primed to view your content favorably.
3. It Increases Open Rates: Simple curiosity ("Why are they talking about llamas?") often overrides the impulse to delete.

The Rules of Email Humor

1. Know Your Audience (Seriously, Know Them)

The golden rule of comedy applies to email marketing: read the room.

• B2B Audiences: Humor can work, but it needs to be clever and relevant to their industry pain points. Avoid slapstick or overly casual language if you're selling enterprise software.
• DTC/B2C Audiences: You have more leeway here. Pop culture references, memes (used sparingly), and self-deprecation often perform well.
• The Litmus Test: If you have to explain the joke, it's not funny. If there's a chance it could alienate a significant portion of your list, don't send it.

2. Self-Deprecation is Your Safest Bet

Making fun of yourself (or your company) is generally safer than making fun of the reader or external events. It shows humility and self-awareness.

• Example: "We accidentally sent this email to my mom. Sorry, Mom."
• Example: "Our graphic designer went rogue, but the sale is real."

3. Use the Element of Surprise

Humor often relies on the unexpected. Start a sentence in a typical corporate way and end it with a twist.

• Example: "Important update regarding your account... and pictures of dogs."
• Example: "A serious message about our new socks."

4. Keep it Short and Punchy

A subject line is not a stand-up routine. You have 40-50 characters to deliver the punchline.

• Example: "Not another newsletter."
• Example: "Please buy our stuff so I can keep my job." (Use with extreme caution, depending on brand voice!)

5. Don't Let the Joke Obscure the Value

If the reader opens the email expecting a punchline and gets a dry sales pitch, they'll feel tricked. Ensure the humor in the subject line aligns with the tone of the email body, and that the email still delivers value.

When NOT to Use Humor

There are times when humor is simply inappropriate:

• Transactional Emails: Order confirmations, password resets, and shipping updates should be clear and concise. Don't confuse the reader when they are trying to find important information.
• Apologies or Crisis Communication: If you messed up (e.g., a major outage or a billing error), be straightforward and sincere. Now is not the time for jokes.

Humor is a powerful tool, but it's just one tool in your copywriting toolbox. Use it strategically, test it relentlessly, and never sacrifice clarity for a laugh.