Slightly OT, but from reading about the Dunning-Kruger effect: "Across four studies, the authors found that participants scoring in the bottom quartile on test

Slightly OT, but from reading about the Dunning-Kruger effect: "Across four studies, the authors found that participants scoring in the bottom quartile on tests of humor, grammar, and logic grossly overestimated their test performance and ability. " I find myself wondering -- how do you (formally) test someone on their humor ability?