Spoiler alert: It's a doozy!

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Fixer Upper fans know that Chip Gaines will do anything for a laugh, but Joanna doesn't always find humor in her goofball husband's antics—especially when it involves a client's home. Luckily, there's nothing a good coat of paint can't fix… most of the time.

Chip has never been shy about missteps, and that's especially true in this new book, Capital Gaines: Smart Stuff I've Learned Doing Stupid Stuff. In it, the charming contractor opens up about his biggest mistakes and what they've taught him about himself, the home reno business, and his relationship with Jo. In a recent conversation with GoodHousekeeping.com, Chip went even further, revealing the biggest mistake he's ever made on the set of Fixer Upper. Spoiler: it's a doozy.

WATCH: Chip and Joanna Behind the Scenes Sneak Peak

"Hands down, the time I misunderstood Jo's direction and demoed the wrong wall. I took that thing down all the way to the studs before I realized what I'd done," he said. Even though Joanna was shocked, he said they were able to work together to find a solution. "I've never been so glad that Jo doesn't hold a grudge!" he added.


For more Chip stories, pick up Capital Gaines: Smart Stuff I've Learned Doing Stupid Stuff, when it hits stores Oct. 17th.