Science Pranks

Fun Science Pranks and Practical Jokes

Some of the coolest pranks and practical jokes rely on science. Learn how to make stink bombs, color someone's urine, change the color of coins, and more with this collection of science pranks.

1
Classic Homemade Stink Bomb

Make homemade stink bombs using matches and household ammonia.
Make homemade stink bombs using matches and household ammonia. The smell is every bit as nasty as from commercial stink bombs. Lisa Kyle Young, Getty Images

While this stink bomb is homemade, it contains the same chemical found in (expensive) storebought stink bombs. Combine two common household ingredients and let the stink begin!

2
Burning Bills

This $20 is on fire, but it is not being consumed by the flames. Do you know how the trick is done?
This $20 is on fire, but it is not being consumed by the flames. Do you know how the trick is done?. Anne Helmenstine

Take the money and set it on fire. With this technique, you'll get lots of fire, but the bills will be completely unharmed.

3
Rubber Egg and Rubber Chicken Bones

If you soak a raw egg in vinegar, its shell will dissolve and the egg will gel.
If you soak a raw egg in vinegar, its shell will dissolve and the egg will gel. Anne Helmenstine

You can bounce this egg like a ball or bend the chicken bones as if they were rubber. If you make rubber egg from a raw egg, the yolk of the egg will remain liquid, so if you throw the "ball" hard enough it will splatter egg everywhere.

4
Baking Soda and Ketchup Prank

Putting baking soda in a ketchup bottle can make a mess.
If you add some baking soda to a bottle of ketchup, carbon dioxide gas will be produced which will cause the ketchup to "pop" when it's opened. Henrik Weis, Getty Images

What happens if you add baking soda to someone's bottle of ketchup? The baking soda reacts with the acid in the ketchup in much the same way as it reacts with vinegar in a baking soda volcano, except in this case its ketchup that goes everywhere and not fake lava.

5
Supercooled Water

If you disturb water that has been supercooled, it will suddenly crystallize into ice.
If you disturb water that has been supercooled or cooled below its freezing point, it will suddenly crystallize into ice. Vi..Cult..., Creative Commons License

You can chill a bottle of water past the freezing point of the water. The water will remain liquid in the bottle, but as soon as you open it to drink it or pour it, the water will freeze into ice. You also can supercool canned soft drinks, such as colas.

6
Disappearing Ink

Disappearing ink makes a stain when wet, yet vanishes when the ink dries.
Disappearing ink makes a stain when wet, yet vanishes when the ink dries. Southern Stock, Getty Images

This is a classic prank that you can set up yourself. Prepare an ink that produces a stain when you squirt it onto paper or clothing, yet becomes invisible once it dries.

7
Gold and Silver Pennies

You can use chemistry to change the color of copper pennies to silver and gold.
You can use chemistry to change the color of copper pennies to silver and gold. Anne Helmenstine

The next time someone asks you for some pennies, why not give them pennies that appear to be made of gold or silver? The pennies are still pennies, but a chemical reaction has altered the chemical composition of the outer layer of the penny. Still legal to spend? Who knows... go find out!

8
Colored Urine

You can color your urine blue or green by drinking a methylene blue solution.
You can color your urine blue or green by drinking a methylene blue solution. Methylene blue may also color the whites of your eyes blue. Anne Helmenstine

There are several harmless foods and chemicals that can be used to safely color someone's urine. Methylene blue, for example, can color your urine blue. It will even (temporarily) turn the whites of your eyes blue.

9
Green Eggs

The 'white' of this egg is green because I mixed a little red cabbage juice into it.
The 'white' of this egg is green because I mixed a little red cabbage juice into it. Anne Helmenstine

Whether you want green eggs and ham or just like colored eggs, you can use a kitchen ingredient to turn the whites of your eggs green.