One thing that I continually have trouble remembering is on which letter the diaeresis goes and I always have to think quite hard about it. In Spanish, it's always on the first letter, which must be a u. In French, it's always on the second letter, which may vary. This came to mind today because I needed to type “sinvergüenza”—meaning “scoundrel”, and literally, “without shame”—when describing a New Mexico state senator's characterization of the U.S. president.