Back by local demand, Karen Davis has been tearing up backrooms and independent theaters for years, lost count. It’s been a wild ride. Short on rehab, long on self-doubt. Join Karen for her first abbreviated set since last Friday when she monologued at her latest roommate, Tina Slatter, on proper bathroom etiquette when you got a clogged drain and no wire hangers in sight. We’d attach her contact info, but Karen’s between e-mail addresses right now.