A lawyer jumps out of his chair exclaiming: "My client is innocent, my client is innocent!!"... The judge awkwardly looks at him and asks: "How do you claim that your client is innocent when he just has admitted a murder and robbing a bank?!"... The lawyer argues: "So are you going to question me and take the words of a murdering thief?!"
I know it may not make sense, but thats the beauty of the joke... Sometimes non-sense seems to make a persuasive argument to unsuspecting audience!!