Sick ‘n’ simple squirmin’ worms effect
OK, so this video from YouTuber beachj0 includes no explanation, but my belief is that there are one or more cylindrical magnets embedded in the plastic bait worms (possibly by casting them in place using the DIY bait molds commonly sold to fisherman), and several more magnets attached to a platter rotating beneath the table. A simple effect, but strikingly creepy. [via Propnomicon]