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Will Ferrell left his co-star "literally dying" when he "went off" on an improvised riff during filming for his latest movie.
The comic actor appears alongside Zach Galifianakis in The Campaign, which follows two rival politicians vying for a seat in Congress to represent their small district.
Dylan McDermott, who plays an intense political operative in the comedy, says working alongside two of Hollywood funniest men was perilous at times.
"There was one time, I think we were in Will's house and it didn't make it into the movie. Will just went off. Nowadays you can shoot things digitally, for 15 minutes takes. Will sat there for 15 minutes and just went off," he smiled in an interview with Collider.
"It was so incredible to have him riff. I was dying, I was literally dying. The whole crew was just crying and laughing and trying to keep it together for 15 minutes while he just kept going and going and going and going! It was hilarious."
Dylan admits that Will and Zach's improvisation added hours of light relief on set. The cast were constantly playing with their lines in order to produce the funniest material possible.
"They do improvise a lot, Will and Zach, but they also stick on the script. We do the script for sure, and then when we get that maybe alternate lines will come in, then they'll make something up," he explained.
"Making a comedy is a lot different to making a drama because we don't know exactly what is funny until the audience sits there and laughs or doesn't laugh, so we have to try a bunch of different things."
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