French fries come in tons of shapes, the question of which one is the best can divide diehard junk food fans. There’s waffle, curly, shoestring, steak, and, of course, crinkle cut fries, which are the favorite of many eaters — and there's even a scientific reason behind the appeal and deliciousness of these wavy fries.

The crinkle-cut shape gives a fry more surface area, increasing its outer crispiness — the gastronomic key to happiness — and helping it keep that crunch for longer, staving off sogginess. The nooks in the fry also easily scoop up condiments for maximum flavor, like the way a Tostitos scoop tortilla chip holds more salsa.

The crinkle cut fry's excellent culinary engineering has led to a dedicated fanbase. When burger chain Shake Shack removed crinkle-cut fries from its menu in 2013, fans made their rage clear through online petitions while sales plummeted, and so the chain brought the fries back, proving that you shouldn't mess with crinkle cut fans.