PSA: Chrissy Teigen did not photoshop her underwater butt in the pool on New Year's Day.

But she did—true to form—totally call someone out on Instagram for suggesting it.

If we're going to wade through this one, we'll have to brush up on some light physics.

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Okay so remember all that stuff in middle school about a stick in a water cup looking like it doesn't line up?

That's refraction...

Google.com (screenshot)

Apologies if you absolutely remembered that and I'm being condescending.

You're a real wiz and your day will come.

Great, so now that's all sorted out, back to Chrissy Teigen being savage on the internet.

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The model and actress spent New Year's Day poolside with hubby John Legend and their two kids.

A couple takeaways—that family looks incredibly cute and well-adjusted.

Bravo to them.

Also I really need to move to L.A. How is that a viable New Year's Day activity?

Extremely jealous of Chrissy Teigen and John Legend right now.

Thing is, this wasn't the only captured moment of the family day. Which brings us to 2020s earliest Insta clapback moment.

Teigen also posted the following photo on her Instagram.

And now back to the aforementioned science—BUTTS REFRACT TOO.

One of her followers, however, had a much different, biting take on the situation.

Instagram/@commentbycelebs

Aaaand...

...cue Chrissy Teigen to absolutely not be having any of it.

Instagram/@chrissyteigen

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Luckily, Chrissy Teigen's Instagram posse had no hesitation jumping in to defend her.

Instagram/@thedavidbell

Instagram/@rhymeba

Instagram/@southern_bell_la

It's 2020 folks, but there are some lessons from the last decade we need to remember.

Like don't come for Chrissy Teigen unless she sends for you.

Want to learn about other optical illusions? The Purple Cow - Optical Illusions Science Kit for Kids is available here.

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