Matt Damon has dressed up as a fuel-pump and Ben Affleck as an ear of corn in a spoof charity film to raise awareness of climate change and promote alternative fuel sources.
The pair and a host of Hollywood stars have agreed to star in the video - created by the Center for American Progress Action Fund.
In Clean My Ride, Flex My Fuel, Damon spoofs his movie character Jason Bourne, urging Congress to make changes and punching a guy who asks him to dance - all while wearing a fuel pump costume.
He says: "Come on, Congress. Come on, big oil. Mandate cleaner cars and cleaner fuel. A little bit of corn and a pinch of can-do attitude is all it takes. And kids love it, too. Yippee I feel like I'm being Punk'd."
Affleck's wife Jennifer Garner, Sarah Silverman, Jason Biggs and Joshua Jackson also appear in the film.
The first of a six-part series of videos is already appearing on website Youtube.com.