There's been a bit of a funny back and forth between The Russo Bros and Mark Ruffalo.
It all started when Ruffalo appeared on Jimmy Fallon, where he jokingly "spoiled" the Avengers 4 title.
According to comicbook.com, The Russos then responded by jokingly "firing" Ruffalo over Twitter.
Fans are now pressing Ruffalo to reveal the Avengers 4 title, since he's technically fired anyway.