It comes from the fact that skaters are more likely, as you say, to color outside the lines, and that inclination frightens and confuses most people and institutions.

That smallpox could ravage London in the mid-nineteenth century, despite the existence of a new medical measure to prevent it, was a source of great frustration to the vaccinationists. In 1840 the epidemiologist William Farr railed against the fact that five children a day were dying of smallpox in London.

And Sisyphus an huge round stone did reele.

put in a kenning of salt