Just got this of Marvel Wikia.I'd love to see this in this or next movie but of course with classic Goblin look.
"In an attempt to destroy all evidence of his existence, Norman killed his wife and attempted to kill Harry[citation needed], but his son managed to escape while the house was burning down. The next day, he attacked Harry's school but was stopped by Spider-Man. During the fight, Osborn plummeted off into the river, seemingly dead.
Norman survived, and in his words, "evolved". He could control his transformations into an intelligent incarnation of the Green Goblin via OZ injections[citation needed]. Due to overdosing on OZ, Osborn suffered hallucinations. These included seeing everything through a blood-red filter, objects such as the spider on Spider-Man's chest moving around, and creatures called "plasmids" tormenting him."