If you've never seen Ann Randolph perform, then you might think it's strange to say that she keeps finding new and amazing things to do with her face. But in her one-woman shows at the Marsh — including the long-running Squeeze Box and current hit Loveland — she demonstrates just how inventive you can be when your features appear to be made of very warm rubber. (She's frequently compared to the late Gilda Radner, and for good reason.) Besides being a first-rate physical comedian, she's also an exceptionally good writer, crafting sly narratives that somehow never devolve into pure mugging for laughs. But make no mistake: She can mug like nobody's business, sending the audience into hysterics with little more than a bug-eyed grin.