another rabbit

Teacher: If I gave you 2 rabbits, and another 2 rabbits and another 2, how many will you have?
Johnny: Seven Sir


Teacher: No, listen carefully. If I gave you 2 rabbits, and another 2 rabbits and another 2, how many will you have?
Johnny: Seven


Teacher: Let me put it to you differently. If I gave you 2 apples, and another 2 apples and another 2, how many will you have?
Johnny: Six.


Teacher: Good. Now if I gave you 2 rabbits, and another 2 rabbits and another 2, how many will you have?
Johnny: Seven!


Teacher: Where the fuck do you get seven from?
Johnny: Because I've already got a FUCKING rabbit at home.