The document describes the Black Hole Foreign Data Wrapper, which is presented as a minimal but working foreign data wrapper that can be used as a skeleton for developing real foreign data wrappers. It claims to provide unsurpassed data compression, zero unintentional data loss, and unbeatable speed, but notes that it is almost totally useless. The author encourages attending their talk the next morning to learn about what can be done with a real FDW and contributing more FDWs, especially with the new ability to support Insert, Update and Delete operations.