"Your body is a wonderland," sang John Mayer, wrongly.
What he obviously meant to sing was "Your body is Wonderland," as in, "Your body, like mine, like everyone's, is a surreal and frequently terrifying Lewis-Carroll hellscape where everything exists in a state of constant flux, where rules of logic and intellect get trammeled by whim and caprice, and where the governing authority is casually malicious and heedlessly cruel."
Our bodies hate us. They delight in our dismay and embarrassment. This is an essential human truth, but it's one that adults forget.