"Seven Rabbits" joke

Teacher: If I give you two rabbits and two rabbits and another two rabbits, how many rabbits have you got? Paddy: Seven!

Teacher: No, listen carefully again. If I give you two rabbits and two rabbits and another two rabbits, how many rabbits have you got? Paddy: Seven!

Teacher: Let''s try this another way. If I give you two apples and two apples and another two apples, how many apples have you got? Paddy: Six.

Teacher: Good. Now if I give you two rabbits and two rabbits and another two rabbits, how many rabbits have you got? Paddy: Seven!

Teacher: How on earth do you work out that three lots of two rabbits is seven?

Paddy: I''ve already got one rabbit at home now!