How likely are kingsnakes to try to eat themselves

[IHaveADogToo]

I'm very interested in kingsnakes lately, but I am paranoid, of course, that the snake will try to eat itself. How justified is this fear? Is this something a kingsnake owner has to deal with once in a lifetime, or once a week? Has your kingsnake ever tried to eat itself? Are some species of kingsnake more likely to eat themselves than others? What preventative measures can be taken to help keep the snake from trying to eat itself?