Our bodily functions don't always operate like a well-oiled machine, doing this or that when our brains command our bodies to. Take hypnic jerks—the seizure-like movements that can't be combated or explained—for example. They are prime examples of how weird our bodies can be on occasion.

In the video below, Joe Hansen (from "It's Okay to Be Smart") looks at a few other strange, involuntary movements our bodies sometimes make without consulting us first.

WATCH: "5 Weird Involuntary Behaviors Explained!"

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