This one I absolutely love, because I've hardly ever heard it, and it has a kind of hidden thoroughness:

From Olive Anne Burns "Cold Sassy Tree" which takes place in the deep south: "He's either stupid or crazy, one." (meaning that the person referred to is 'one' of the choice: stupid, crazy. It's damn near mathematical out of set theory.

From Kinky Friedman and the Texas Jewboys: "They oughta send you back to Roosha, boy, or New York City, one; (You just wanna diddle a Kerstian gal and y'kill God's only son!)" The meaning is similar, and the song is based in Texas.