A lecture about English
A linguistics professor was lecturing to his English class one day. "In English," he said, "A double negative forms a positive. In some languages, though, such as Russian, a double negative is still a negative. However, there is no language wherein a double positive can form a negative."

A voice from the back of the room piped up, "Yeah, right."

At a jury trial with the jury consisting of 8 men and 4 women...
At a jury trial with the jury consisting of 8 men and 4 women:Defendant: "Your Honor, I wish to change my plea."Judge: "Is someone using undue influence to prompt you to change your mind?"Defendant: "No sir, when I pleaded Not Guilty I didn't know there would be women on the jury. Since I can't even fool my wife, I'll never be able to fool the four women jurors."