Brace yourself, folks.

By Jessica Remo | NJ Advance Media for NJ.com

There was something afoot on the NJ Transit train Candy Hatsune Wolff was riding yesterday.

First, she heard the noise — some sort of electric machinery, a pitched, vibrating sound rising above the train din.

Then, she saw the sheer horror: A man was sloughing off the callouses on the bottom of his feet with, what appeared to be, a Dremel.

Wolff began to record the event on her phone, as one does when one finds herself adjacent an in-transit public pedicure.

And then, naturally, she posted it in a neighborhood Facebook group so that others could see what she could not unsee.

Those folks had questions. We chatted with Wolff to get answers. Here's what we know.

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When and where did this get underfoot?

Aboard a southbound NJ Transit North Jersey Coast Line train between Rahway and Long Branch around 1 p.m. Wednesday, Wolff says.

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What did she think once she realized what was happening?

"Should I take a picture? I don't want to humiliate him," she says. "Eventually I decided to."

Truly, she had no choice but to take the, err, footage.

"I know some people who rock flip-flops 365," she says. "I guess the callus was bothering him."

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Did anyone tell the guy to stop?

Nope, says Wolff.

He pedicured in peace — in fact, she thinks she's the only one who saw the feat (feet?) go down.

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Did he do both feet?

Yes. Of course. To baby-smooth perfection over about a 10-minute period, Wolff says.

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Did it leave a mess?

Wolff says she didn't see one.

"I actually didn't see anything flying off/on the floor," she says. "I still don't know how he decided it was OK on the train."

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What stop did he board/exit?

Toetowa? Foot Lee? Nah ... not on this line.

Wolff isn't sure exactly where he boarded, and she exited before him.

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Is this the grossest thing anyone's ever done on an NJ Transit train?

We bet not.

But it's one of the few that's been caught on video, and comes on the heels of the man who was caught shaving his face on an NJ Transit train.

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Anthony Torres says he was the rider caught shaving on a New Jersey Transit train in a video that went viral. (Matt Rourke/Associated Press)

Though first mocked on the internet for the behavior, it was later revealed that the man was homeless.

A GoFundMe was started on his behalf, and he was even offered a job interview by NJ Transit.

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Has a Dremel been used for pedicuring before?

Yes, in fact, according to Twitter.

Sometimes to the embarrassment of the person being Dremel'd in a pedicurist's chair, it appears.

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Just gave myself a pedicure with a Dremel 3000. — becca (@beckyleathr) September 22, 2018

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This dude next to me getting a pedicure has the poor little woman standing up and using a dremel on his damn feet. — Alex Tevis (@a_tevs) August 19, 2018

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It makes me nervous when they break out the Dremel for a pedicure. — Joel 🌧 (@jhooks) August 10, 2018

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Getting a pedicure with my daughter & this lady is using a Dremel moto-tool on my crusty ass feet. — Buck Burrows (@hillrat) July 15, 2018

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I'm ashamed. Today's long overdue pedicure featured a Dremel. She is charging the belt sander. pic.twitter.com/UEIb5550PJ — Shannon Morrison (@ShaMorrison) June 29, 2018

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I got my first ever pedicure with my wife and daughters today. What's the first thing they pulled out on me? A Dremel. Yeah, you heard me right... A damn power tool lol. It was like the scene from Dumb & Dumber. pic.twitter.com/xsSleCzxqx — Travis Hale (@Subie_SmAsH) June 4, 2018

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Is this guy a professional pedicurist?

Perhaps.

"He did seem to know what he was doing," Wolff says. "I think he did a good job."

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The rest is a mystery

Where is the train pedicure guy now? What important event could he have been primping for? Or is this simply part of his commute?

And should we really judge before we've walked a mile in his flip-flops?

The world may never have the answers, but one thing is for certain: Nothing, nothing is sacred on an NJ Transit train.

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Jessica Remo may be reached at jremo@njadvancemedia.com. Follow her on Twitter @JessicaRemoNJ. Find NJ.com on Facebook.