[ravenstine]

Would the film Idiocracy have been as funny if instead of making fun of Costco, Starbucks, and Carls Jr., they referred to them as Costinc, Sunbucks, and Carlos Sr.?

Parody doesn't necessarily require that you make significant alterations to a symbol or name. Only imbeciles would think that the fictional "Fuck you - I'm eating" slogan actually represents the Carls Jr. company in real life.