21. Espresso machines
The words, “Do not remove filter unit when under pressure,” are good advice. You know this if you’ve ever had to clean up the aftermath of a coffee bomb.
22. Boiling salted water
The scientific jury is still out on this one, but I personally witnessed a panful of salty water explode upward and outward about 2 feet, with very serious results. Current theory points to overly salinated softened water as the cause.
Exploding ice can actually break the glass or mug.
24. Hot/cold glass filled with cold/hot liquid
Seems like you can do this a hundred times with no problem, but sometimes the glass shatters, even violently.
The familiar popping of a real wood-burning fireplace is actually little explosions of trapped pitch, sap or water. Cozy, no?
26. TV tube
An old fashioned TV tube is much harder to break than a light bulb, but it implodes just like one. A very good reason not to buy a real tool set for your two-year-old.
Many household batteries are theoretically explosive, while car battery explosions are by far the most common.
28. Septic tank
Problems with a system can lead to methane buildup. Not the best place for plumbers to take a smoke break.
Trees can explode due to fire or a lightning strike, both of which heat the water in the wood. Extreme cold can freeze the sap inside maple trees, causing it to expand.
30. Mentos and Diet Coke
If you haven’t tried this awesome kid experiment, suffice it to say that you should never wash down 11 Mentos candies with a half-liter of Diet Coke.