Robert Downey Jr. sparks 'Avengers' battle over who has the best 'stache

11:16am PDT - March 20th, 2019    robert downey jr - Mashable

Robert Downey Jr mustache Twitter a very important question. The Iron Man himself 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 intern…