Heartless personality Jonathan Nail interrogates helpless patrons during opening weekend of Iron Man. | Video courtesy of Just Us Films No one doubted that Iron Man would easily top the box office this weekend, but the scale of its success is virtually unprecedented. The latest entry from Marvel's deep stable of superheroes blasted early estimates of $60-70M by raking in a mammoth $104.3M since Thursday night's late showings. It was the second-largest, non-sequel debut......