At a fund-raiser for the Sundance Institute last night, notorious crabby comedian Chevy Chase was bragging about being a better skier than Robert Redford. But when questioned further, Chase admitted he'd never shared a slope with Redford. "I assume [I'm better]. I’m a lot younger, and I’ve done a lot of racing," said Chase, forgetting what happens when one assumes. Get more trash talk from Joe Pantoliano, Christine Lahti, and others by clicking through our Party Lines Slideshow.