A Paradox in Catch-22

YouTube video

Catch 22 logic is a paradox coined by Joseph Heller in the 1961 novel of that name: to get out of a combat duty, one has to be crazy. But whoever applies to get out of combat is not crazy, so, can not get out of combat duty. Side remark: this clip was added when preparing for Math 22a, a vector calculus and linear algebra course.