According to Downey Jr., Mel taught him about second chances and cast him in The Singing Detective, after he got out of jail.
In an effort to repay the favor, Downey was influential in getting Mel the cameo in Hangover 2, and it became pretty tense between the Due Date stars after Mel lost the role.
Sources say that Downey felt Mel deserved another chance, and that he's "pissy" with Galifianakis for his big part in getting Mel fired.
We're certainly happy that Mel was able to help bring about Robert Downey Jr.'s resurgence, especially since he's done a lot of great stuff lately, but we still have to veer closer to Galifianakis' side on this one.
Who do U side with? Robert Downey Jr. or Zach Galifianakis?
[Image via WENN.]