Ben Affleck and Jimmy Kimmel.

This is Jimmy Kimmel's response to Sarah Silverman's song about Matt Damon.

Celebrities in the video: Brad Pitt, Harrison Ford, Joan Jett, Robin Williams, Don Cheadle, Meat Loaf, Pete Wentz, Dominic Monaghan, Macy Gray, Perry Farrell, Lance Bass, Huey Lewis, Josh Groban, Christopher Mintz-Plasse, Joel Madden, Benji Madden, Dicky Barrett, Rebecca Romijn, Christina Applegate, and Cameron Diaz.