Teacher:  If I
gave you 2  cats  and  another 2 cats and  another 2, how many  will  you
have?
Johnny:
Seven,  Sir.
Teacher:  No,
listen   carefully… If I  gave you 2 cats,  and another 2   cats and another
2, how many  will  you   have?
Johnny:
Seven,   Sir.
Teacher:  Let
me put it to  you   differently. If I gave  you 2 apples, and  another  2 apples
and  another  2, how many would  you  have?
Johnny:
Six.
Teacher:
Good. Now if I  gave  you 2  cats, and another 2  cats and another  2,  how many
would you   have?
Johnny:
Seven!!! SIR!
A   very   angry Teacher: Where
in the hell do  you  get  seven  from?!?!?
A   very angry   Johnny:  Because,…..
Because I’ve  already got a  stupid  cat… SIR !!!