Birthdays are all about laughter, surprises, and a little harmless mischief—because what’s a celebration without some fun? If you’re looking to make someone laugh on their big day without crossing any lines, these 37 hilarious birthday pranks and jokes are just the right mix of silly and safe.
Whether you’re planning a playful office setup, a gentle family prank, or a surprise for your best friend, each idea here keeps things fun, friendly, and totally birthday-approved.
Related: 58 Playful and Harmless April Fools Pranks for Kids
Funny & Harmless Birthday Pranks
- Balloon Avalanche
Tape a trash bag full of balloons above a door. When they open it—instant birthday balloon storm! - Fake Cake Surprise
Make a “cake” out of stacked sponges, frosted like the real thing. Watch their confused first cut. - Password Changed to “It’sMyBirthday”
Change their computer background to a note saying: “Your password is now: ILoveCake123.” - Desktop Explosion
Cover their entire desk in wrapping paper—each pen, stapler, and monitor included. - Upside-Down Office
Flip their entire desk setup upside down. Leave a note: “Hope you have a topsy-turvy birthday!” - Sticky Note Takeover
Post-it note everything. Bonus points for writing fun messages on each one. - Voice-Activated Printer
Place a fake sign on the office printer: “Now voice-activated. Please speak louder.” Watch them yell commands. - Empty Gift Box Game
Wrap multiple boxes inside boxes until the last one is… empty. “Surprise! You get… nothing!” - Keyboard Confusion
Switch a few keyboard keys around. Nothing major—just enough to create harmless birthday typing chaos. - Confetti in the Car Vent
Add a little confetti behind their car air vent (only a small amount!). When the A/C goes on—mini celebration!
Related: 55 Best Office Pranks to Try on April Fools’ Day
Food-Themed Birthday Pranks
- Mayo-Filled Donuts
Offer them “cream-filled” donuts—secretly filled with mayo instead of custard. Prepare to run. - Veggie Cake
Frost a stack of raw broccoli and carrots like a cake. Bonus points if you add candles. - Jelly Juice
Serve them “juice” that’s actually gelatin in a cup with a straw. - Inverted Cake Layers
Bake a cake—but put each layer upside down and slightly off-center. When they cut it… confusion. - Birthday Cupcake Surprise
Bake one regular cupcake with hot sauce in the center. Mix it among regular ones. Cross your fingers. - Frozen Cereal
Serve them their favorite cereal… but freeze the milk and cereal the night before. - Brown-E’s
Promise them a tray of “brownies.” Then hand them a tray of cut-out letter “E”s colored brown. - Pickle Ice Cream
Scoop out mashed potatoes and call it vanilla ice cream. Serve with a cherry on top. - Sprinkle Bomb Sandwich
Open their sandwich and pack it with sprinkles. Just because. - Banana Phone
Carve out a banana and hide a note: “Hello? It’s your birthday calling.”
Related: 60 Smart Jokes That Will Impress Your Friends
Mild Tech & Phone Pranks
- Auto-Correct Switcheroo
Set their phone to autocorrect “happy” to “hippopotamus.”
(Change it back after the laughs.) - Siri Birthday Mode
Change their phone wallpaper to say: “Ask Siri to sing ‘Happy Birthday’ 10 times.” - Reversed Mouse Settings
Flip their mouse scroll direction. Safe, silly, and quickly fixed. - Blasting Birthday Music Alarm
Change their morning alarm to something ridiculous like “Barbie Girl” or a mariachi version of Happy Birthday. - App Icon Shuffle
Rearrange their home screen and hide their favorite app in a random folder.
Related: 60 Clever Pi Day Jokes That Are Both Smart and Silly
Surprise Decor & Setup Pranks
- Bedroom Balloon Fill-Up
Fill their room with balloons—ceiling to floor. The more, the better. - Bathroom Mirror Message
Write a message on the mirror with a dry erase marker: “Mirror, mirror… you’re a year older!” - Closet Confetti
Tape confetti to the inside of their closet door so it falls out when they open it. - Car Cling Onslaught
Cover their car with cling film or sticky notes. Bonus: spell “HBD” across the windshield. - Backwards Clothes Closet
Turn all their hanging clothes inside out or backwards for a funny surprise.
Related: 111 Animal Jokes That Are the Wildest in the Kingdom
Social & Verbal Birthday Gags
- Secretly Tell Everyone It’s Their 60th
Even if they’re turning 25, tell everyone it’s a big milestone year. Watch the reactions. - Over-the-Top Singing Telegram
Organize an embarrassingly grand “Happy Birthday” serenade with a group of coworkers or friends. - Fake Party Setup
Tell them the party starts at 7. Actually plan it for 8. Watch them be “early” for once. - Mismatched Gifts from Friends
Tell everyone to give random objects (paperclips, socks, rocks) in gift wrap. “It’s the thought that counts!” - Dramatic Gift Reveal… for Socks
Present their gift with epic build-up… then hand them plain white socks with a bow. - Announce Birthday Facts All Day
Randomly say facts like, “Did you know more babies are born on your birthday than any other day?” - Surprise Zoom Bomb Party
Coordinate a surprise virtual birthday “ambush” with everyone singing loudly at once. Cue chaos.
Final Thoughts
Birthdays are a great excuse to celebrate the people you love with laughter, surprises, and just the right amount of silliness. These 37 safe and hilarious birthday pranks and jokes are light-hearted, low-stakes, and high on laughs—just the way birthday fun should be.
So go ahead and prank with love. Just remember: their birthday today… yours might be next.
If you enjoyed this post, save it to Pinterest and inspire others! 🌟
Related:
77 April Fools Jokes to Make Everyone Laugh
66 Hump Day Humor Jokes & Quotes to Get You Laughing Through Wednesday
