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How do you pay tribute to Robert Downey Jr.?

That's the question that has Mel Gibson, Jamie Foxx and Garry Shandling stumped in a roast video that played before Downey was honored with the American Cinematheque Award last month.

As we learn, Gibson's only there for the cheese plate, Shandling's never seen Downey out of the Iron Man costume and Foxx ... well, he's still bitter about Tropic Thunder.

"He stole a part from brothers," he says. "F--- that! He does this now. If we don't nip it in the bud, next thing you know, they have him playing Martin Luther King: 'I have a dream that one day little white boys will grow up to be bigger white boys and take roles from all of the black people.'"

Robert Downey Jr. to Hollywood: Forgive Mel Gibson

It turns out none of them really know Downey that well, except for Gibson, who once visited him when Downey was in prison. "But I was just trying to get good press," he says."That would be confusing ... I just wouldn't know who's in, who's out," Shandling notes.They all try to come up with excuses to get out of the event — until Shandling points out what they would miss out on: a Jodie Foster clip.Watch the video below.

[Warning: Contains profane language.]