In my distant, distant past, when I was in elementary school, I learned a “rule” about spelling: I before E except after C, or when sounded like A as in neighbor and weigh. But it’s hardly a hard-and-fast rule; there are lots of exceptions like peignoir, weird, beige, science, and one of my favorite words, deign.
What are not exceptions to the rule are thief and thieves. Please ignore this misspelling on the home page of Yahoo! Autos: