Calvinball je šílenost, kterou snad ani počítač nemůže hrát :) V základních pravidlech jsou sdělení ve smyslu, že pravidla se pořád mění, např.
The only consistent rule states that Calvinball may never be played with the same rules twice. Scoring is also arbitrary, with Hobbes at times reporting scores of "Q to 12" and "oogy to boogy.
nebo
Primary Rule: The following rules are subject to be changed, amended, or deleted by any player(s) involved. These rules are not required, nor necessary to play Calvinball.
1.0. The following words in these rules are mostly freely interchangeable, the Primary Rule applies:
Can, May, Must, Shall, Should, Will, Would
Více např. zde:
http://www.bartel.org/calvinball/
http://en.wikipedia.org/wiki/Calvin_and_Hobbes#Calvinball