Using your phone and an everyday object, record an ordinary sound that can stand in for something extraordinary and/or otherworldly.
When Linda Blair’s head turns a full 180 degrees on her possessed neck in The Exorcist it's actually a wallet twisting. Sound designers hit slabs of meat for the punches in Rocky and Fight Club. Packaged liver sliding in a flat container made the sound for E.T's walk (which Spielberg described as "liquidy and friendly.") Turns out, when a bullet hits liquid metal it sounds like an empty glass being dropped into a bucket of yogurt (and when the T-1000 morphs around the jail cell bars, it's wet dog food sucked from the can with a vacuum cleaner hose). A metal endoskeleton stomping on a human skull was a pistachio shell. Spidey's comic book "thwip" was fishing line and shaving cream; Nightcrawler's "Bamf" a vintage camera flashbulb. The legs and arms of Transformers' Jefire was a creaky oven door. A porcelain lid slowly slid from a toilet tank was the opening of the Ark of the Covenant. Freddy Kreuger's glove was a combination of leather and steel, a belt twisted and a knife slid along the blade of another knife. A wafer cone crumbling was the hatching velociraptor in Jurassic Park. So, then, think nut shells, ice cream cones, watermelon, meat, cabbage, keys, toilet tanks, etc. Try to recreate one of these sounds or come up with something new.
Attach the sound to a black frame/pic (so we can't tell what it actually is). Post it in the Comments section under the relevant heading on the FB Group page, titled with what you're suggesting it is (EX: UFO, DINOSAUR, TORNADO, LASER GUN, ROBOT FOOTSTEPS, etc.)