A home cook who heard a loud bang when they were sautéing onions was left stunned when they discovered the source of the noise.
The original poster (OP), user AceKalibur, shared a photo on Reddit of their cast-iron skillet, which was badly cracked—a major split running from the side to the middle.
“Apparently, my cast-iron pan decided it didn’t want to do this anymore,” they quipped.
Reddit users weighed in via the comments, with one suggesting, “If someone in the past put the hot pan in the sink, it could have developed a small crack then.”
“I split my cast iron pan this week as well, on an induction top, luckily it wasn’t my favourite one!” another commenter posted. “Didn’t know it could do that, and the bang scared the crap out of me.”
“That’s some bad luck s*** if I’ve ever seen some,” a third individual noted, to which the OP replied, “Soon after, I got stranded 10 miles out when my bike tire popped with no spares.
“I must have angered a god or some spirit.”
In a message to Newsweek, the OP said the sound of the cast iron breaking was “terrifying.”
“You don’t expect to hear what sounds like a gunshot going off when you are just cooking dinner,” they said. “I nearly had a heart attack because of the noise.”
Once they got over the fright, however, they found the situation immensely frustrating—and not just because a well-maintained cast-iron skillet broke.
“I now had a bunch of onions that were sitting in this pan, and I had to hurry and transfer them to a new one before they got messed up,” they said.
‘Finally snapping’
The OP urged caution with cast-iron pans.
“It is thought that a micro crack formed due to someone in my family, most likely my brother, pouring cold water into the pan to cool it right after using it to cook,” they noted.
“When heated up again, [it] caused the crack to grow before finally snapping when making it all the way through.”
Thermal Shock
A cast-iron skillet can split or crack for several reasons, most of which involve thermal stress, manufacturing flaws or physical shock.
One of the most common causes is rapid temperature change, often called thermal shock. Cast iron expands when heated and contracts when cooled, but it does so slowly compared with many other metals.
If a skillet is heated very quickly—such as being placed on a high burner while empty—or cooled abruptly, like running cold water over a hot pan, different parts of the metal can expand or contract at different rates.
Best Practices
Best practices for caring for a cast-iron skillet focus on proper heating, cleaning and seasoning to keep the metal durable and naturally nonstick.
Cast iron should be heated gradually rather than placed on very high heat right away, which helps prevent thermal stress and potential cracking.
After cooking, the pan should be cleaned while still warm using hot water and a brush or scraper, avoiding harsh detergents that can strip away the protective seasoning layer.
Thoroughly drying the skillet is important because cast iron can rust if moisture remains on the surface. Many cooks also apply a thin layer of oil after cleaning and heat the pan briefly to maintain the seasoning.
With consistent care—gentle heating, minimal soap and regular seasoning—a cast-iron skillet can remain in excellent condition for decades.
Dining and Cooking