A group of blokes - as in, grown men and not immature teenage boys - were spotted sitting on deck chairs, rating female joggers out of 10 in Perth.
They were armed with a massive whiteboard so they should share their rating with the public and the women they were objectifying.
A woman, known only as Elizabeth, spotted them yelling and whistling as she ran by.
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"It took me a second to realise they were actually rating me and other women who ran by out of 10," she told ABC news.
"I stewed on it for the rest of the run because I didn't really take it all in at the time."
She said while she was initially shocked, she grew angrier as she ran along.
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"When you see something like that, that makes you feel small and scared, you sort of want to laugh it off to make everyone feel comfortable, but then I got angrier and angrier as I ran along," she said.
"Then on the way back I decided I wasn't going to stand for that and so I decided to say something."
Elizabeth said she thought about her friends, sisters, and other women that may change running routes or might never run again because of the men's behaviour.
"Something that people may perceive as a harmless joke can have long-term damaging effects on women and their confidence," she said.
So, she confronted them. With her phone out, she began filming and asked: "Do you know how uncomfortable that makes people feel?"
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In the footage, one man can be seen hiding his face behind the whiteboard, while another whooped 'yeah the boys', pumped his arms in the air and then called himself a 'feminist'.
"Do your workplaces and families mind sexists?" she can be heard asking in the footage.
Elizabeth told the ABC that men also need to call out this type of behaviour if they see it in public.
RMIT Professor Nicola Henry said gender inequality has shaped this kind of brazen behaviour.
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"These behaviours exist on a continuum," she said.
"A woman across her lifetime will experience many instances of sexual and street harassment. But she might also experience a sexual assault, or numerous sexual assaults ... online abuse ... images being taken and shared without her consent ... coercive control and domestic violence."
Henry has a point: sexual harassment does exist on a scale.
But women have no idea where the man yelling remarks at them might lie on that scale.
Topics: Viral, Australia, News, Sex Education