In theory, the main character of Obvious Child might’ve had a different occupation; she could have been an accountant, or a grad student or a waitress. But Donna Stern is a stand-up comedian, and that is as it should be. Her act consists of exposing her personal problems and making them funny, in a style that’s meant to be honest and maybe cathartic. Likewise, the movie attempts to air difficult, tangled issues in a blunt, no-sweat sort of way. Both Donna and her movie are pretty successful.