There's something very odd about the video showing off "Be", a prototype battery-less motorized toothbrush

Be is presented as an "electric-free" toothbrush powered by a wind-up mechanism. A couple of twists of the handle yields two minutes of brushing, according to its Kickstarter campaign, which raised nearly half a million dollars on boasts of its simple usefulness and eco-friendliness. A similar tally is listed at a follow-up Indiegogo page.

Unlike electric toothbrushes, Be. is more than just a vibrating head. Built as a kinetic storage device, Be. harnesses and amplifies the power of 2 simple twists into over 80,000 tartar fighting brush strokes using its patented multiplier transmission system.

But there's a problem with the Be, which is yet to ship. Or, at least, with a recently-posted video, since removed, depicting a prototype. https://www.youtube.com/watch?v=EfheHKaRF10

Spoiler: leaves in the video's background loop uncannily, like an animated GIF, as the brush appears to run for a minute or so: "The plant skips in perfect sync with the prototype," says Marek Baczynski, who spotted the crudely-looped section of video and posted it to YouTube with commentary. "It happens 18 times, every 49 frames."

Here's the demo video's audio waveform, which also gives the game away:

Here's the portion of Baczynski's expose that shows the original demo "defaked" to remove all the loops:https://youtu.be/EfheHKaRF10?t=160

One million American dollars crowdfunded. Fifteen seconds of action, brushing the air.