Little johnny counting problem

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 hell do you get seven from?!?!?

Johnny: Because I bloody have 1 at home!!!