I like cats —

teacher: if i give you 2 cats, and another 2 cats, and another 2 cats, how many would you have? me: 7 teacher: no, let me try again. if i gave you 2 apples, and another 2 apples, and another 2 apples, how many apples would you have? me: 6 teacher: that's correct! so, if i give you 2 cats, and another 2 cats, and another 2 cats, how many would you have? me: 7, duh! teacher: where do you get this 7 from? me: i already have a cat!!