In the grand scheme of creativity, sometimes two completely different people come up with the same idea by sheer coincidence. It's called "parallel thinking," and it explains how we occasionally get two or three Tarzan and Hercules movies in a row, and that time you and your friend both decided to rob the same donut store on the same night without having consulted with each other beforehand.
However, sometimes two movies turn out to be so similar, in such ultra-specific ways, it makes you wonder if, well, there wasn't at least a tiny bit of ripping off going on. Judge for yourself:
Iron Man 3 Clearly Wanted To Be The Incredibles
Obviously, superhero movies are going to overlap in a bunch of ways -- it's not plagiarism if your hero shrugs off a bunch of gunshots and then makes a wisecrack about it. Hercules probably did that. But Iron Man 3 seems to have taken nearly its entire story from The Incredibles. The two films share so many oddly specific details it's like Marvel was trying to cheat on a math test by stealing the smart kid's paper and writing their name on it instead.
First off, both movies begin with a flashback of the main hero's younger years as he gets approached by an annoying but earnest fan. The hero blows the fan off, looking like a jerk in the process:
"Sorry dude, the Real Genius set is over there."
Flash forward to the present. In both films, the hero is having a midlife crisis because he's worried he's not doing enough to help the world. At one point, he does something blazingly reckless, which he justifies because he's afraid he can't protect the people he loves. Also, they both wear red and yellow suits.