Close to midnight, the residents of a neighbourhood in Fairfield, Connecticut, USA, noticed something lurking in the dark. Under the moonlight, they saw a sight that made them freeze in horror.

Because it was Mombies (moms who are zombies), on Halloween night.

That’s right, an army of over 40 “mombies” terrorised a neighbourhood in Fairfield, with their brilliant flash mob (video above) to Michael Jackson’s Thriller (and a couple of other songs).

Though they were both terrific and terrifying, the flashmob out for more than a thrill. The event, named Dance to Donate, was held to raise money for The Cancer Couch, a national metastatic breast cancer research foundation. It was organised after the Fairfield Mombies’ flash mob performance last year went viral (video below).

“When you do the math knowing that one in eight will be diagnosed with breast cancer, this statistic hits close to home,” the organiser Terry Davis told CT Post. “We wanted to raise awareness and funds for metastatic breast cancer because it impacts so many lives.” The Mombies also wanted to show their “tech-savvy” children that “good, old-fashioned fun still rules.”

They seemed to have realised their motives, as they not only delighted their audience, but also raised more than $8,000 and counting.