Linguistic mismatch phenomena involve semiotic functions that attach to forms in defiance of grammatical design features. Noun phrases, when used as predicates, provide one example: how do predicate nominals correspond to our theories of what nouns mean? How do such phenomena challenge traditional conceptions of grammar? How do competing theories of the syntax-semantics interface stand up when confronted with mismatch phenomena? Mismatch addresses these questions through the efforts of some of the most original thinkers in syntactic and semantic theory, exploring a wide variety of mismatch phenomena in a broad sampling of languages.