"Crazier than a turkey making Thanksgiving plans."

 "More delusional than a Chihuahua in a Pit Bull fight."

 "Dumber than a waterproof sponge."

 "Nuttier than a squirrel turd." 

 “It ain’t what you don’t know that gets you into trouble. It’s what you know for sure that just ain’t so.” ~Mark Twain