harry's dad tried to do an experiment on himself to enhance his performance and make him stronger but something went wrong which gave him a split personality and made him really strong. His split personality turned evil and used the costume and glider board already made by his company to terrorise the city. the people of the city saw his costume and nicknamed him the green goblin.
P.s. this is from spiderman not Harry Potter WikiAnswers
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Harry's mom is unemployed but she used to work in a shop. His dad is an engineer.
It was a green cake who has : Hapee Burthdei Harree (Happy Birthday Harry)! in liver and strawberry frosting. And he gave him Hedwig.
dont know the exact jacket, but its defo from Guess
because harrys wand and 'voldemorts' are twins so the can 'wound but not fatally harm one another'
Because... Everyone was a Goblin