Burbage Theatre Company isn’t afraid to showcase oddball work, and that seems to be the case with their new production of Will Eno’s 2003 play The Flu Season. Man is a playwright in a mental hospital. Woman is someone he’s having an on-again off-again affair with. There’s a Doctor and a Nurse. Scenes are introduced by a chipper Prologue and a glum Epilogue. It’s all very abstract, though Eno’s said that he’s aiming for “brave and new and moving and meaningful” more than just experimental for the sake of being experimental.