To the annoyance of students and academics alike, the law of tort contains a number of awkward heads of liability which defy classification except under “Miscellaneous” or some similar rubric. This article explores one such: the action on the case for damage to the plaintiffs reversionary interest in a chattel. This oddly obscure head, of liability does not even have a generally-accepted name (in this article it is christened, for brevity, “reversionary damage”). It is traditionally dismissed by the text-books in a paragraph or two; the leading cases on it are rarely cited; and yet in practice it is a highly important aspect of the law of personal property without which the owner's protection would be seriously incomplete.