Nope, a sense of humour comes free with the membership card. If someone tries to sell you Marxism, but can't make you laugh, they are faking it.
Read the original:
The Eighteenth Brumaire of Louis Napoleon by K.M. himself:
http://www.marxists.org/archive/marx...maire/ch01.htm. The funniest shaggy-dog story ever written, with added dialectical materialism.