I sang, and thought I sang very well; but he just looked up into my face with a very quizzical expression, and said, “How long have you been singing, Mademoiselle?”

That’s from Lillie de Hagermann-Lindencrone’s 1912 book In the Courts of Memory. What’s remarkable about it? This section:

I sang, and thought I sang very well; but he just looked up into my face with a very quizzical expression, and said, “How long have you been singing, Mademoiselle?”

… contains all 26 letters of the alphabet.

At 56 letters, it’s the shortest known example of a “pangrammatic window.”