[The joke isn't mine, and I am unaware of its authorship]
-- Please, tell me, if a black cat has crossed one's path there
and back again, what does it mean? Has she doubled the
punishment or canceled it?
-- Is it a scalar cat or a vector one?
Selected by Brad Templeton. MAIL your joke to fu...@netfunny.com
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This joke's link: http://www.netfunny.com/rhf/jokes/14/Mar/cat.html