Are Pringles potato chips? From 2007 to 2009, that question plagued judges at three different levels of the British judiciary, leading to a series of head-scratchingly comical legal proceedings. The stakes, however, were nothing but serious: The ruling put hundreds of millions of dollars on the line.

The question revolved around Britain’s value-added tax, or VAT. According to the 1994 VAT Act, any product that is “wholly, or substantially wholly, made from the potato” was subject to a 17.5 percent tax. In 2007, Britain’s VAT and Duties Tribunal determined that Pringles fell under the tax’s umbrella—and demanded the chipman payeth.

Procter & Gamble, who owned Pringles at the time, vehemently disagreed. They argued that Pringles were only 42 percent potato flour, with the rest mostly a slurry of wheat starch, corn and rice flour, and vegetable oil. The snack food, they said, could not be classified as a potato chip because, unlike a real potato chip, its overall contents and shape were “not found in nature.”

In addition to being unappetizing, this argument was a marked shift from the company's original position. When the snack first hit shelves in the mid-1960s, Pringles were proudly marketed as “potato chips.” (More specifically, as newfangled potato chips.) They did this despite reported complaints from competing chip-makers, who argued that the snack food—which is cooked from a thin, mashed potato-like dough—should be classified differently.

But now that millions of dollars were on the line, Procter & Gamble’s lawyers wholeheartedly embraced Pringles's unique place as a “not-really-a-chip” chip. The VAT and Duties Tribunal, however, didn’t buy it. In a decision that sounds more like a Zen kōan, the tax masters argued that Pringles were chips because they were “made from potato flour in the sense that one cannot say that it is not made from potato flour.”

To that, the British High Court of Justice basically replied: Wow, that's confusing! Now, excuse us, we would like to top it.

The following year, the High Court stepped in and reversed the Tribunal's decision. First, the Court argued that Pringles were more akin to a cake or bread than a chip. (Who, of course, can forget their first birthday Pringle?) Furthermore, the Court declared that a Pringle—which we should emphasize is, in fact, mostly made from potatoes—was not “made from the potato." Their reasoning invoked Greek metaphysics, claiming that Pringles did not possess the required amount of (and this is their word) “potatoness.”

The controversy didn’t end there. In 2009, the case moved up another judicial wrung, this time to Britain’s Supreme Court of Judicature. The lower court's metaphysical arguments about "potatoness" were enough to make Aristotle's brain hurt, the justices moaned. They criticized the previous ruling for its “overelaborate, almost mind-numbing legal analysis” and dubbed the topic at hand a “short practical question calling for a short practical answer.”

Procter & Gamble’s lawyers bore down anyway. They claimed that a product made from “a number of significant ingredients ... cannot be said to be ‘made from’ one of them.” Lord Justice Jacob called this argument hogwash. If that were true, he argued, then “a marmalade made using both oranges and grapefruit would be made of neither—a nonsense conclusion."

After working itself in and out of semantic pretzels, the Court said the easiest solution to Chipgate was to appeal to a hypothetical child: If you asked an 8-year-old to explain what a Pringle was, what would he or she say?

The question of a Pringle’s identity, the Court argued, “would probably be answered in a more relevant and sensible way by a child consumer than by a food scientist or a culinary pedant.”

In other words, a chip is a chip is a chip—Pringles among them. With that, Procter & Gamble had to pay $160 million in taxes.

Though common sense prevailed, it doesn’t always end that way: Around the time of the great Pringle debate, the state of Oklahoma was busy confidently declaring watermelon a vegetable.