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Described as an explosion by some and a sonic boom as others, residents near Eagle Lake at about 5:30 p.m. Saturday started phoning 911 regarding an explosion.
The only problem? The Racine County Sheriff's Department and Kansasville Fire couldn't find anything.
"We investigated it and nothing found," said Kansasville Fire Chief Scott Remer. "We have no cause or origin.
"I heard a lot of things about 'my house shook,'" he added.
Area residents also flooded social media seeking an explanation for what happened. On a local area 'buy, sell, trade' list on Facebook, people referred to the noise as something "blowing up" and said the noise shook homes.
Another person later explained there were some fireworks going off, and called the situation "all good." However, that was about two hours after the initial report.
Wisconsin Department of Natural Resources Warden Mike Hirschboeck said ice heaves on the lake could have created a loud booming noise.
Comment: See also: Unexplained loud booms: A compilation from 2015