Hence my parenthetical. But since you mentioned amendments, you should look into the Corwin Amendment [1], which was written to preclude its own repeal. The amendment was an all-in attempt to appease the slave states and prevent the Civil War, but was too little and too late. The purpose may be distasteful to the modern reader, and may not have held up in court ('Can Jesus microwave a burrito so hot that he cannot eat it?'), but it's there.