This egg inside another egg is a perfect YouTube specimen

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Which came first: the chicken, the egg or the second egg?

Okay, we don't know, but we do know this: amid all the late-night clips and VEVO spam, there occasionally emerges a popular YouTube video that is just weird and cool.

Behold: the stunning 2017 film "Egg Inside an Egg."

The clip goes pretty much how you'd expect. A mysteriously large egg is opened to find — surprise! — another, smaller egg inside. When they crack open the second egg, there's just a yolk, although it is slightly paler than most yolks.

RELATED: Cost of eggs in 10 cities around the U.S.

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Cost of eggs in 10 cities around the US
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Cost of eggs in 10 cities around the US

Los Angeles, CA

Avg. cost per dozen: $3.90

New York, NY

Avg. cost per dozen: $3.57

New Orleans, LA

Avg. cost per dozen: $3.31

Houston, TX

Avg. cost per dozen: $2.97

Seattle, WA

Avg. cost per dozen: $2.93

Raleigh, NC

Avg. cost per dozen: $2.79

Orlando, FL

Avg. cost per dozen: $2.89

Albuquerque, NM

Avg. cost per dozen: $2.73

Indianapolis, IN

Avg. cost per dozen: $2.71

Sioux Falls, SD

Avg. cost per dozen: $1.77

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This egg-inside-egg phenomenon is called a counter-peristalsis contraction. Basically, it's when an egg that has already passed through the hen's oviduct gets sucked back up before it can finish developing, allowing another egg to develop around it.

Poultry Science editor Gregoy Bedecarats detailed the whole phenomenon to BuzzFeed in 2013: "Sometimes, if you have another ovulation before the first egg is laid, you have a 'counter-peristalsis contraction,' which means the oviduct will contract upward, and the first egg will be moved back up."

"When you see a tiny egg incorporated [in a larger one], it means the egg was still present in the shell gland, and got sucked back up the oviduct to where the other egg was having its white deposited," he said.

Then, voilà — a mega-egg.

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New ways to eat eggs for breakfast
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New ways to eat eggs for breakfast

Spinach and Cheese Bagel Strata by Melanie Makes

Get the recipe here.

Baked Egg Custard with Gruyere and Chives by Katie at the Kitchen Door

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Huevos Rancheros Enchiladas by Oh My Veggies

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Quinoa Spinach Bake by The Healthy Apple

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Grilled Vegetable Frittata by Beard & Bonnet

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And, as you may have noticed, the mega-egg is very big — so big, in fact, that the guy who made the video was surprised it "didn't kill [his] hen" on its way out.

He also wrote that everyone in the room was too scared to eat the egg, so his wife used it to make hair conditioner.

Here's how to do that, in case you're curious:

See? The internet just keeps on giving.

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