With 'High Potential,' Kaitlin Olson Finally Gets to Go Darker

If there's one thing Kaitlin Olson has perfected since making her television debut as Cheryl's snarky sister, Becky, on "Curb Your Enthusiasm" 25 years ago, it's playing wacky, edgy, self-absorbed characters with questionable moral codes. She's done it for the better part of two decades on FX's "It's Always Sunny in Philadelphia," TV's longest-running live-action sitcom (and still going), where she portrays narcissistic pub waitress Deandra "Sweet Dee" Reynolds. She did it for two seasons on Fox's "The Mick" as a foul-mouthed smoker unfit to raise her wealthy . . .