NASA: "We need 15 digits of π for interplanetary travel precision."
Mathematicians: "With 40 digits, you could calculate the universe's circumference with hydrogen-atom precision."
Engineers building skyscrapers with π = 3: *maniacal laughter*
This is why bridges wobble, folks! Engineers are out here rounding π to the nearest highway speed limit while physicists are clutching their pearls. The difference between theory and practice? In theory, there's no difference. In practice, the engineer says "eh, close enough" and goes to happy hour.