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."