Watchly Safety Review

Bare Hand Bottle Busting- Science Investigation

Mark Rober

5:26 · 22.6M views · August 31, 2016

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Minor FlagsReviewed June 2026

6Minor Flags

2No Issues

This science experiment video is largely safe and genuinely educational, walking kids through the physics of pressure, cavitation, and the scientific method using slow-motion footage of glass bottles being smashed. The main caution is that the experiment involves shattering glass bottles and briefly mentions beer and nail polish remover, which could inspire unsafe imitation without adult supervision.

Content Breakdown · 8 Categories

Hidden Advertising & Sponsored ContentNot present

The description transparently discloses links to collaborator Kevin's channel and a high-speed camera rental service with clear attribution, which does not constitute hidden advertising; no undisclosed sponsorships are present in the transcript itself.

See evidence (2)

“Description openly credits Nathan for the high-speed camera and links to his rental service”

“Music credits are fully disclosed in the description”

Parasocial & Emotional ManipulationNot present

A standard subscription call-to-action appears ('PLEASE CONSIDER SUBSCRIBING') in the description, but the transcript itself contains no guilt-tripping, manufactured drama, or emotional manipulation tactics.

See evidence (1)

“'PLEASE CONSIDER SUBSCRIBING' in description — polite and non-coercive”

Substance Use & Sports BettingA little

Beer bottles are used as props and briefly mentioned ('I actually don't drink, but I've heard of people doing this with beer bottles'), and beer tags appear in the video metadata, but alcohol is not glorified or consumed — the host explicitly notes he doesn't drink and the focus is entirely on the physics experiment.

See evidence (2)

“'I actually don't drink, but I've heard of people doing this with beer bottles'”

“Beer used as one of several test liquids alongside water and sparkling water”

Toxic Behavior ModelingA little

The experiment involves breaking glass bottles, which carries some imitation risk, but the hosts explicitly include safety warnings and the content is framed as a structured science investigation rather than reckless behavior.

See evidence (1)

“'Be safe, this is glass, and glass can cut you if you're not careful where it lands' — explicit safety guidance provided”

Low-Quality, Extreme & Stunt ContentA little

While the video features a visually striking stunt (breaking bottles with bare hands), it is substantively grounded in scientific explanation and hypothesis testing rather than being shock-value or stunt-driven content.

See evidence (1)

“High-speed camera footage of bottle breaking used to verify scientific hypothesis, not purely for spectacle”

Playful & Fantasy ViolenceA little

The video includes lighthearted physical comedy (flaming snowballs, bottle breaking) presented in a playful, consequence-aware context. The hosts laugh and joke throughout, and the glass-breaking is framed as fun science rather than aggression.

See evidence (3)

“'You should set those on fire' — playful suggestion about flaming snowballs”~0:12

“Hosts laughing as bottles shatter during experiments”~1:00

“Triumph horn sound effect used comedically after successful breaks”

Dangerous Internet ChallengesA little

The bottle-breaking technique is demonstrated and viewers are given a step-by-step guide to replicate it, which involves glass and some physical risk. However, the hosts provide explicit safety warnings and the content is framed as science education rather than a viral challenge promotion.

See evidence (2)

“Step-by-step tips provided: 'hit the bottle and not your hand', 'use water or something non-carbonated', 'be safe, this is glass'”

“'Don't chicken out. It hurts way more if you don't follow through' — could encourage risky imitation”

Realistic Violence, Threats & WeaponsA little

The video involves breaking glass bottles by hand, which carries minor physical risk (as the host acknowledges), but this is framed as a science experiment rather than violence or a threat. No weapons, threats, or harmful intent are present.

See evidence (2)

“Glass breaking during experiments”

“'Be safe, this is glass, and glass can cut you if you're not careful where it lands' — safety warning provided”

What Parents Need to Know

This video is a collaboration between two popular science YouTubers who use the 'bottle busting' trick as a springboard for a real, structured physics investigation — forming hypotheses, isolating variables, and drawing conclusions from evidence. Kids genuinely learn about pressure waves, cavitation, vapor pressure, and carbonation in an engaging way. However, the experiment involves glass bottles that shatter, and the hosts do briefly reference beer (though neither is shown drinking). Nail polish remover is mentioned as a liquid with high vapor pressure. The video includes a safety reminder about broken glass, but the overall setup could tempt older kids to try this at home without proper precautions. There is also a brief segment where flaming snowballs are shown, adding a minor fire element. Best watched with a parent for younger viewers who might want to replicate it.

Talk to Your Kids About

1What is a hypothesis, and can you remember one of the hypotheses Mark and Kevin tested in the video?
2Why do you think it's important to change only one thing at a time when doing an experiment?
3The video shows glass shattering — why would it be dangerous to try this at home without an adult, and what safety steps would you need to take?
4What surprised you most about what actually causes the bottle to break — was it what you expected?

Bare Hand Bottle Busting- Science Investigation

Protected Viewing

What's This Video About?

Kevin and I get to the bottom of a science mystery using only our wits and rugged good looks. Check out Kevin's channel- https://www.youtube.com/user/TheBackyardScientist Thanks to Nathan for the High Speed camera. If you need a High Speed camera to rent for super cheap check him out. Insanely low prices for great gear- http://www.aimed-research.com/ MUSIC- 0:12- Ceral Killa- Blue Wednesday- https://soundcloud.com/bluewednesday 4:19- Berlin- Andrew Applepie- http://www.andrewapplepie.com/ Summary: Using the Scientific Method and with the help of the Backyard Scientist, we determine how someone can break a glass bottle with their bare hands. PLEASE CONSIDER SUBSCRIBING: http://tinyurl.com/MarkRober-Sub **************************************** I make videos like this once a month all year long while supplies last: CHECK OUT MY CHANNEL: http://tinyurl.com/MarkRober-YouTube FACEBOOK: https://www.facebook.com/MarkRoberYouTube TWITTER: https://twitter.com/#!/MarkRober INSTAGRAM: https://www.instagram.com/markrober/

Frequently Asked Questions

What age is this video appropriate for?

We recommend a minimum age of 10 for this video. The science content is engaging but the experiments involve shattering glass, references to beer, and materials like nail polish remover that could encourage unsafe imitation in younger children.

Is this video safe for kids to watch?

The video is generally safe and has strong educational value, but it does involve glass bottles breaking and briefly references beer and flammable liquids. Parental supervision is recommended, especially for children under 10 who may want to try it themselves.

Could my child be inspired to try this dangerous experiment at home?

That is the main concern with this video. The hosts do include a safety tip about broken glass, but the experiment is presented as something viewers can replicate, which could encourage kids to handle glass bottles unsupervised. It's worth having a conversation about why adult supervision is essential.

Is there any drinking or alcohol content in the video?

Beer bottles are used as props and carbonated beer is one of the test liquids, but neither host is shown drinking alcohol. The reference is brief and contextual to the science experiment, not glamorizing drinking.

What does my child actually learn from this video?

Kids learn about the scientific method, pressure waves, cavitation, vapor pressure, and why carbonation behaves differently under impact — all explained clearly with slow-motion footage. It's a strong example of curiosity-driven, hypothesis-testing science communication.

Is there any inappropriate language or content?

There is no strong language, sexual content, or bullying in this video. The tone is enthusiastic and collaborative throughout, making it a positive viewing experience aside from the physical safety concerns around the glass-breaking experiments.