Robert W. Leisure posted this shorty on the Groaners listserv.
In the early 1700s, the captain of a Spanish pirate ship was very proud of his mongrel pet for its ability to bark once for “Si,” and twice for “No.” After being captured by a British commander, the dog was taught the same trick in English. He, thereby, became
. . . the world’s first “Si” and “Aye” dog!