Burger King faces a bizarre Whopper lawsuit after customers claim the burger is much smaller than advertisements suggest. As the case grills America’s fast food expectations, Burger King and its Whopper are now at the center of a legal battle about size—and supersized marketing promises.

With 19 plaintiffs from 13 states now demanding financial compensation and an end to “35 percent larger” menu hype, the viral Burger King Whopper lawsuit is fueling a national debate on fast food truth-in-advertising—and turning every drive-thru into a legal battleground.