Barring stormy skies or bad fortunes, visitors to Scoville Park on Oct. 21 will find a coven of witches swishing their brooms to a German reggae-pop song that translates to “Shake Your Bacon.” The witches aren’t real witches — they’re a group of Oak Park residents who gather once a year dressed in a variety of black skirts, sparkly dresses, pointy hats and green face paint. This year marks the sixth time the Oak Park witch flash mob will perform the dance, which is a choreographed piece performed around the world to Peter Fox’s “Schüttel deinen Speck.”When Oak Park resident Sarah Corbin stumbled in 2018 upon a video of the dance, which is performed near Halloween all over the world, she wanted to bring it home. Corbin created a Facebook group for interested locals, which now has nearly 300 members.