【】

Robert Downey Jr. mustache Twitter a very important question.

The Iron Manhimself assembled an elite force of very opinionated Twitter users when he put his fellow Avengers co-stars on blast. With some throwback photos, he called upon the forces of the internet, asking them to settle the debate once and for all — who wore it best?

Tweet may have been deleted

Some fans immediately jumped into their extremely valid (and slightly thirst-driven) opinions.

Mashable Top StoriesStay connected with the hottest stories of the day and the latest entertainment news.Sign up for Mashable's Top Stories newsletterBy signing up you agree to our Terms of Use and Privacy Policy.Thanks for signing up!

Tweet may have been deleted

Tweet may have been deleted

Tweet may have been deleted

Tweet may have been deleted

Tweet may have been deleted

Tweet may have been deleted

For others, though, the competition was getting a little too hairy. So, naturally, the memes started rolling in.

Tweet may have been deleted

Tweet may have been deleted

Tweet may have been deleted

Tweet may have been deleted

Personally, I think Twitter has got this ALL wrong. You want to know who wore it best out of everyone in the entire MCU? Have you forgotten about cameo legend, Stan Lee?

Tweet may have been deleted

Tweet may have been deleted

You heard the man. "'Nuff said."

---

Featured Video For You

---

Disney reaches out to terminally ill Avengers fan

---

TopicsMarvelTwitterCelebrities