In the August 1969 Kickshaws, Dave Silverman briefly discusses the word game "Conjugating Irregular Verbs" (I am firm, you are obstinate, he is a pig-headed fool), and suggests a "Rich man, poor man" variant (rich man: tired; poor man: lazy). But such games can also be played in deadly earnest, particularly in religious and political confrontations.
Cohen, Aaron Martin
"I Am Firm, You Are Obstinate,"
Word Ways: Vol. 6
, Article 3.
Available at: http://digitalcommons.butler.edu/wordways/vol6/iss3/3