A joke is not a thing but a process, a trick you play on the listener's mind. You start him off toward a plausible goal, and then by a sudden twist you land him nowhere at all or just where he didn't expect to go.
“For so long as the Jew has even one ally, he will be convinced - in his smallness of mind - that his salvation came from that ally. It is only when he is alone - against all of his own efforts and frantic attempts - that he will, through no choice, be compelled to turn to G-d.”
“My job is to support businesses, that means promoting British commerce in the big emerging markets that have been neglected in the past. It means keeping Britain open to inward investors, trade and skilled workers. It means cutting red tape which is suffocating growing companies which create jobs.”