An elementary school teacher is asking a student a Maths question

Teacher: “Ok, Jimmy. If I gave you two cats and another two cats, how many cats would you have?”

Jimmy: “Five!”

Teacher: “No, Jimmy. Let me ask you another way. If I give you two apples and I give you another two apples, how many apples would you have?”

Jimmy: “Four!”

Teacher: “Good, Jimmy! Now if I gave you two cats and another two cats, how many cats would you have?”

Jimmy: “Five!”

Teacher: “Jimmy! That is incorrect! Why are you answering with five?”

Jimmy: “Because I already have a cat!”