Killing Gwen Stacy
His treatment of his son, Harry
The Clone Saga
Kidnapping (and possibly killing) baby May
Kidnapping Aunt May and faking her death
Trying to brainwash Peter into being his son
Threatening to murder his grandson
Torturing the Avengers Academy kids
Two things to retort on. 1) Lifetheft happened because of Harry Osborn, not Norman.
2) Gwen willingly slept with Norman. He didn't rape her.
The better question might be "What is the worst thing Marvel has done to Norman Osborn?" That list would be long and justifiable!
But to stay on topic...the worst thing would have to be toturing children. It's one thing to kill, but it's a far more disgusting low to torture...especially children.
I'm gonna say the most heinous thing Norman has ever done was try to assassinate Mendall Stromm. If I'm remembering correctly, he tried to do this prior to being exposed to the Goblin serum, so he was yet to be driven insane due to the toxins. So it was a pre-meditated hit, with no insanity defense to fall back on.
He did Gwen Stacy, but she's the kindest woman in the world. In a way, you can say she's the nicest thing he's ever done!
I always thought the worst thing was Norman being responsible for the baby's death. Like everything else seemed tamed in comparison to the whole, " caused my enemy's wife to have a stillborn". He actually did something horrible to a baby, to bad it got retcon.
I'd say killing Gwen. Anything else he has done, while it could be more evil, has not topped that. All the other things he has done is pretty pale in comparison to the point of rediculousness. There was a point where everything bad that happened to Peter Parker, was all thanks to Norman... "Peter Parker's goldfish died when he was 8? That's because Norman Osborn went and boiled it alive before Peter got home from school, therefore cementing his place as the arch enemy". I don't even get what kidnapping Aunt May and replacing her with an actress was supposed to do...he might as well have killed her if he wanted to hurt Peter...
"If you can't say anything good about someone, sit right here by me." - Alice Roosevelt Longworth, on manners
"It's not whether you win or lose, it's whether I win or lose." - Peter David, on life
I said Killing Gwen Stacy because in my mind Sins Past never happened. Whenever someone tries to tell me it really did I just cup my ears and say La La La La La Not My Gwen LOL
Friend Of O’l Marvel - Nuff Said
When I became a man I put away childish things, including the fear of childishness and the desire to be very grown up.-C.S.Lewis
I'd say the worst thing he's yet done is not appear in an issue of Amazing Spider-man for over 100 issues.
Empty winds scrape on the soul never stop to realize/Animal whisperings intoxicate the night
Hypnotize the desperate slow motionlight/Wash away into the rain
Blood, milk and sky....