Because Dec 25 = Oct 31
Cancer
Because OCT 31 is the same as DEC 25.
A monascary
My favorite is: "There's a maniac living in our neighborhood. He goes house-to-house leaving severed body parts on the doorstep. He gives me the willies."
Because Dec 25 is Oct 31
Because oct 31 = dec 25
He always gets DEC 25 and OCT 31 confused.
They were too GUI.
Because DEC 25 = OCT 31
Banana cake!