6 or 7?

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

Johnny: Seven Sir
a

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

Johnny: Seven
a

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.
a

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

Johnny: Seven!

a

Teacher: Where do you get seven from?

Johnny: Because I have already one rabbit at home..