Milwaukee's Unexplained 'Screeching Bad Boy' Noise Leaves Residents Baffled and Cats 'Freaking Out'

For about two hours on Monday night, something in Milwaukee made a noise that nobody had been able to explain as of Wednesday, and that some residents swear was repeating the words 'bad boy'.

People living more than a mile and a half apart heard it on 21 September, from the streets near the Rockwell Automation clock tower down to Baran Park. Descriptions vary between a mechanical screech and a looping recorded voice.

Milwaukee police said they received no reports about it, the city's emergency management office has ruled out its own siren network, and the source remained unidentified.

What People Heard

Brandon Kitts, who lives in Walker's Point, spent the evening ruling things out. 'It doesn't sound like a siren. It's not a train. It's not a tornado. Nothing like that,' he told WISN 12 News, which first reported the story.

The noise came in bursts rather than continuously. Kitts said he noticed it intermittently over roughly two hours, with one stretch lasting about 15 minutes before it stopped and then started again an hour later.

He was reaching for explanations by the end of it. 'I'm just like, and I don't believe in aliens like that, but also it's like anything's possible, right?' he said. Others who heard it described a recording repeating the phrase 'bad boy', while some simply called it a screech.

The animals noticed before the people did. John Martinez, who lives near Baran Park, said his cats reacted first. 'I had my cats out, and they just started freaking out. They were jumping around, going in the bushes, so I turned around and let them in the house,' he said.

Why Nobody Can Locate It

The geography is part of the puzzle. Residents near the Rockwell Automation clock tower heard it, and so did people more than a mile and a half to the south, a spread that does not fit a small single source such as a car alarm or a domestic appliance.

Martinez said the sound seemed to bounce off houses in the area, which may have made its direction difficult to determine by ear.

The obvious candidate has been ruled out. Some residents speculated that the noise came from a tornado siren, but Milwaukee's Office of Emergency Management told WISN that its system is not designed to broadcast audio and was not the source.

No agency has identified it. Milwaukee police said they received no reports of the noise, and the Department of Neighborhood Services and Alderwoman Marina Dimitrijevic likewise had no reports, which leaves the account resting on residents who happened to be outside at the time.

Cities Have Been Here Before

Unexplained noises have a habit of taking over neighbourhoods. In 2016, Forest Grove in Oregon spent weeks trying to identify a piercing sound that residents compared to a bad one-note violin played through a microphone with constant feedback, and that arrived without warning after dark.

That case became a local preoccupation. Police said they had heard every theory going and believed there was a logical explanation, warning that if the noise was being produced deliberately it would be unlawful. They considered a prank but never confirmed one.

Years later, a Pacific University physicist and an audio engineer proposed that a faulty heating and ventilation unit or a poorly sealing valve may have produced the sound, an explanation the city never formally adopted. The reports eventually stopped and no official explanation was established.

More recent cases have proved equally stubborn. Residents of the Northside, Clifton and Camp Washington neighbourhoods in Cincinnati reported a whirring, oscillating hum beginning in December, and in Brooklyn's Fort Greene, residents in 2022 described a humming resonance that could continue for hours and was piercing enough to keep people awake.

What those cases share is the pattern now playing out in Milwaukee. A sound arrives without warning, enough people report hearing it to suggest it was not an isolated experience, it proves hard to trace because of how it travels, and the agencies contacted have no record identifying its source.

Until someone can match the recording to a source or an agency identifies what happened, Milwaukee is left with two hours of noise, a handful of witnesses and some very unsettled cats.