In Addison v. State, 173 Md.App. 138, 156, 917 A.2d 1200 (2007), Judge Meredith, in identifying the unique exception, pointed his finger precisely at this leak in the dike of non-appealability as the "one very unusual exception." The Court of Appeals distilled the limited scope of the collateral order doctrine to "one very unusual situation" that "involves trial court orders permitting the depositions of high level governmental decision makers" under certain circumstances. (Quoting St. Joseph Hospital v. Cardiac Surgery, 392 Md. at 87-88).