There's a great scene in The Avengers: Age of Ultron when Pietro and Wanda are explaining why they hate Stark so much and joined HYDRA for experimentation:
"We were ten years old. Having dinner, the four of us. When the first shell hits, two floors below, it makes a hole in the floor, it’s big. Our parents go in, and the whole building starts coming apart. I grab her, roll under the bed, and the second shell hits but it doesn’t go off. It just sits there in the rubble, three feet from our faces. And on the side of the shell is painted one word—Stark. Every effort to save us, every shift in the bricks, I think “this will set it off.” We wait two days for Tony Stark to kill us."
I thought this explanation sounded very similar. And then I watched the original Iron Man again....
When one of his own bombs explodes right next to Tony in the desert, it puts shrapnel into his chest and necessitates the creation of the ARC Reactor that in turn powers the Iron Man suit. Which, of course leads him to become an Avenger.
The Maximoffs have the same origin as Tony Stark.
One of Stark's bombs creates a superhero, but another creates two villains (who later become heroes themselves). They are not as different from each other as they would like to believe.
Bet you didn't see that coming...