Theorem. All governments are unjust.
Proof. Consider an arbitrary government. Since it is arbitrary, it is obviously unjust. The assertion being correct for an arbitrary government, it is thus true for all governments.
(Solomon W. Golomb, in "The Mathemagician and the Pied Puzzler, A Collection in Tribute to Martin Gardner," E. Berlekamp and T. Rogers (editors), A K Peters 1999)