MythBusters · Video summary

Grenades And Guts? | MythBusters | S4 E14 | Full Episode

MythBusters tests Hollywood grenade heroism, self-hypnosis myths, and diet Coke plus Mentos to reveal what really happens with explosives, mind tricks, and reactions.

MythBusters · January 23, 2026 · 49-min episode · 6-min read

Grenades And Guts? | MythBusters | S4 E14 | Full Episode

Key takeaways

⚡Using a dummy with humanlike density can accurately measure blast damage**,” showing the importance of realistic models for safety analysis.4:00
🚀Use realistic models and controlled environments when testing explosive safety measures.14:00
📈Grenade shrapnel speed can reach 10 times the velocity of a typical shotgun pellet, illustrating the lethal power of real explosions.17:01
💡Self-hypnosis CDs do not reliably change physical attributes like eye color or eliminate phobias, debunking their effectiveness.23:00
🔧Verify common internet claims like self-hypnosis or diet reactions with rigorous experiments before believing them.23:00
🎯Jumping on a grenade significantly reduces shrapnel damage to others, confirming the myth that it can save lives in movies.28:41

Chapters

0:02🎯 Introduction and Myth Setup
1:52🎯 Exploring the Hollywood Myth of the Grenade Hero
2:40🎯 Creating Human and Dummy Analogs
6:25🎯 Demo of grenade blast tests with actors and dummy
10:32🎯 Testing the myth of diving onto a grenade in explosions
15:48🎯 Examining the power of grenade shrapnel
28:40🎯 Effects of grenade blast and shrapnel on dummy figures
29:30🎯 Results of grenade impact tests
30:12🎯 The Myth of the Cola and Mentos Explosion
31:56🎯 Pig stomach experiments for stomach explosion myth
35:42🎯 Testing the Diet Coke and Mentos reaction in controlled conditions
37:22🎯 Analysis of reaction differences and final conclusions

The digest

High Level Overview

This episode of MythBusters rigorously tests three popular myths: the Hollywood trope of a hero diving on a live grenade to save others; the effectiveness of self-hypnosis CDs to cure seasickness, phobias, or change eye color; and the viral claim that consuming Diet Coke and Mentos together can cause a dangerous stomach explosion. The investigations blend scientific experimentation with practical demonstration, aimed at dissecting these claims for accuracy and safety. The episode offers insights for enthusiasts of physics, psychology, and public health debunking, emphasizing the importance of empirical testing of often sensationalized beliefs.

Keep reading in The Digest

The full 6-minute article, 21 more sections, and every new episode from MythBusters and the creators you follow.

1. The Grenade Hero Myth: Can Diving on a Grenade Save Others? (00:50–29:20)
Overview
Methodology
Key Findings
Conclusion
2. The Effectiveness of Self-Hypnosis CDs for Seasickness, Phobia, and Eye Color Change (04:40–24:15)
Overview
Methodology & Individual Experiments
Key Findings
Conclusion
3. Diet Coke and Mentos: Can They Cause Your Stomach to Explode? (29:10–38:40)
Overview
Methodology
Key Findings
Conclusion
Key Frameworks and Experimental Design Approaches
Grenade Blast Damage Assessment Framework
Self-Hypnosis Testing Protocol
Diet Coke and Mentos Reaction Simulation
Practical Implications & Takeaways
Action-Oriented Summary