This funny shirt delivers a factually correct, deeply nerdy joke in the most delightfully deadpan way possible: "Everyone on Mars is a robot." It’s a punchline disguised as a planetary truth bomb, printed boldly above and below a drawing of a Mars rover doing its lonely, dutiful work.

It’s the kind of shirt that earns double-takes, then chuckles, then a pause followed by, “Wait… that’s actually true.” And yes, it is. Every “resident” of Mars—from Sojourner to Curiosity to Perseverance—is, in fact, robotic. There are no people. No pets. Just solar panels, camera eyes, and AI-powered science missions silently rolling across the dusty red landscape. And this shirt captures that weird little reality in the best possible way.

Whether you’re a space nerd, a NASA fan, a roboticist, or someone who simply appreciates a well-timed truth, this tee is for you. It’s science humor at its finest—dry, unexpected, and smarter than it looks. Plus, it’s a great way to bond with fellow Mars-loving weirdos without saying a word.

Perfect for science fairs, casual Fridays, or quietly dominating trivia night, this shirt makes a statement that’s funny, accurate, and just a little bit existential. After all, space is lonely… but at least it’s full of robots.

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This fun t-shirt for fans of Mythbusters features icons of the popular show's hosts along with a funny slogan. 

"I reject your REALITY and SUBSTITUTE my own" is written in mixed font sizes and colors. The slogan is featured using a grunge style and has iconic representations of hosts Jamie Hyneman and Adam Savage.

This fun Mythbusters graphic t-shirt is great for fans of science and anyone who loves this long-running old-school popular myth-busting show! It's shown here on a black unisex shirt but can be customized to be printed on a variety of apparel styles and is available in several different color options -- just use Zazzle's easy tools to pick a different style or color garment.

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Today is World Oceans Day! This is a great day to celebrate the world's oceans, but also those who work in this environment and those who work to protect it.

The holiday of environmental awareness, World Oceans Day was first officially recognized by the United Nations in 2008. Celebrate our oceans and spread awareness of ocean-related conservation concerns with this fun holiday shirt, which reads simply WORLD OCEANS DAY within a cute cartoon style image of a colorful reef with a variety of undersea creatures.

Shown here on a women's white t-shirt, it's easy to pick a different color or style of shirt using Zazzle's simple customization tools. 

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Why This “I’m Good with Math” Tee Is an Instant Classic for Engineers

If you’ve ever aced a calculus exam but fumbled the spelling of “engineer,” this funny shirt was made for you.

This “I’m an Engineer... I’m good with math” t-shirt delivers the perfect dose of self-deprecating humor, poking fun at the stereotype we all know is true: engineers are brilliant at problem-solving — just don’t ask them to proofread. With progressively crossed-out misspellings of the word "engineer" leading to the ultimate punchline, this design lands with anyone who lives by the numbers.

For the Left-Brained Legends

Whether you’re designing rockets, writing code, or crunching structural load equations for fun, you deserve a shirt that speaks your language — typos and all. Printed in a casual, handwritten font, this design nails the humor without overcomplicating the joke (engineers appreciate efficiency, after all).

It’s the ultimate go-to for:

• Engineering students

• Professors and lab instructors

• Anyone who thinks Excel is a love language

• Gift-givers looking for a surefire laugh

Great with Graph Paper or a Coffee-Fueled All-Nighter

Soft, comfortable, and smarter than it looks, this shirt is perfect for wearing to class, team meetings, hackathons, or when you’re elbow-deep in a personal project that definitely includes duct tape. It also happens to be a fantastic icebreaker — because every engineer has been there.

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For Space Fans Whose Pulse Races at Every Launch

If rockets make your heart skip a beat, this shirt gets you. Literally.

This Rocket Heartbeat Tee is the perfect mix of science, space, and style — featuring a bold graphic of a rocket ship seamlessly woven into a heartbeat line. It’s a clean, modern design that speaks volumes without saying a word. Whether you’re a budding astronaut, a space program superfan, or just someone who dreams big, this shirt says your love for space runs deep... and steady.

Clean Look, Cosmic Energy

Shown here on a kid's black basic t-shirt, this awesome design can be transferred onto any item in Zazzle's huge catalog, including apparel options for men, women, and babies. The minimalist electric-blue artwork pops off the fabric — a sleek silhouette of a rocket ready for launch, flanked by stylized EKG peaks and valleys. It's a visual pun, a declaration of passion, and a great icebreaker for fellow space nerds.

Ideal for:

• Science fairs and space camp

• Museum trips and STEM events

• Classroom style or everyday cosmic flair

• Anyone whose heart beats for the stars

A T-Shirt That’s Got Heart (and Thrust)

Whether you’re gifting it to a young space explorer or grabbing it for yourself, this tee is proof that science is more than knowledge — it’s emotion, inspiration, and liftoff-level enthusiasm. And with this shirt on, you're always mission-ready.

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Looking for a way to show off your math pride without breaking a sweat? This “Mathletic Department” t-shirt is the perfect mix of nerdy and sporty. With a bold collegiate-style design and the digits of pi (3.14159) front and center, it’s a witty twist on gym class fashion for those who exercise their brains more than their biceps.

Whether you’re a math teacher, student, STEM enthusiast, or just someone who appreciates a smart pun, this shirt is great for mathletes of all kinds. The design is clean, classic, and full of geek-chic energy, making it a great conversation starter in the classroom, at math club meetings, or while out and about. It also makes a fun gift for Pi Day, math competitions, or anyone who knows the only crunches they enjoy come with numbers and logic.

This shirt is all about honoring your brainpower—and maybe poking a little fun at traditional athletics while you’re at it.

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