Paul Rudd's Ant-Man got to coin the phrase "America's Ass" in Avengers: Endgame, but he never got to go up Thanos' ass to save the world per that ridiculous "Thanus" theory. The theory that Ant-Man could shrink down, crawl up Thanos' butt, and then grow to large size to blow up the villain -- yeah, it was always bonkers. But that's why it went viral as a nutso talking point just before the release of Avengers 4.
Now that several months have passed since Avengers: Endgame took the world by storm as the highest-grossing movie of all time, Rudd shared his disappointment that the Thanus theory didn't pan out.
I consider it a lost opportunity.
He then smiled and gave a little chuckle, to show he was proooobably kidding, although the way Thanos was really taken out in Avengers: Endgame was also kind of a bonkers surprise. Who expected Thanos to be killed off twice -- decapitated by Thor, and then snapped away by Iron Man?
I don't think anyone really expected the Thanus theory to happen, it was just something fun for Josh Brolin to joke about while in the bathroom. But Paul Rudd did at least pretend to give the theory serious consideration before Avengers: Endgame came out, wondering why Ant-Man would have to go up Thanos' butt for it to work. Couldn't he fly into Thanos' ear or go up his nose? Obviously that wouldn't be as funny, but sure.
So Thanus will have to join the pile of Avengers: Endgame theories that did not pan out, although there are plenty of theories that did turn out to be true. And it's not like the movie didn't have some crazy twists, so something equally strange could've happened. I mean, a rat was responsible for Ant-Man even being in the movie. Plus, the Endgame team is still trying to explain Captain America's timeline after Steve went back to live with Peggy, so even things that did happen aren't exactly making sense to everyone.
Watch Paul Rudd answer the Thanos butt question around the 8:10 mark of the video, which is a great watch from start to finish:
Avengers: Endgame is now out of theaters and on home video and fans are still discovering cool clues and fun easter eggs. Meanwhile, Paul Rudd is waiting on word for Ant-Man 3, or any other kind of return to the Marvel Cinematic Universe. You can check out his new Netflix series Living With Yourself right now and also stream a bunch of other worthy Paul Rudd movies on Netflix.