Chaos unfolded during Black Friday sales at a Nike Factory Store in the Seattle area.

An estimated 20,000 shoppers inundated the sportswear giant’s outpost at Seattle Premium Outlets in Tulalip, Wash., scattering so much merchandise from shelves that it was hard to see the floor and even harder to navigate the aisles.

“It’s like a zombie apocalypse. I feel bad for the people who need to clean this up. #BlackFriday #NikeOutletStore,” a stunned observer shared on Instagram, attaching a photo of what unfolded.

Another shopper who couldn’t believe his eyes compared the madness to a natural disaster. “I thought there was an earthquake that happened,” a Seattle resident told BuzzFeed News, adding that employees were “overwhelmed.” An anonymous Nike staff member said that around 20,000 bargain-seekers entered the store between 8 p.m. on Thursday and 10 p.m. Friday, BuzzFeed reported.

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Videos and photos shared on social media show hundreds of orange Nike and black Brand Jordan boxes that were strewn across the floor, as well as the sneakers that were contained in them, and cardboard and other packaging scraps.

Incredibly, many shoppers remained undaunted — opting to step on and over boxes and sneakers. Some were seen struggling to find their balance and footing amid the rubble.

https://instagram.com/p/BNQSIsKBQNx/

It must have been quite the doorbuster.

“People [were] not putting anything back in the right place at all the whole time we were open,” the employee told BuzzFeed, adding that it was “Jurassic Park crazy.”