I’m a lifetime comedy nerd. The kind of middle school girl who knew every line to Steve Martin albums and the 2,000-year-old man routines, adored Robin Williams and had a subscription to Mad magazine. As an adult, I worship professionally funny people, especially women. Sometimes, even I’m funny. For years I’d been pondering the idea of an improv class. I wanted to do something separate from the routine of my real life of being a mom, being a wife, having a full-time job and working monthly shifts at the Park Slope Food Coop. I started investigating classes, in particular the eight-week Improv 101 at the legendary Upright Citizens Brigade training center. Some of my favorite comedians had honed their craft there — not to mention that Amy Poehler is one of the founders. Initially, I only shared my desire with the least judgmental person I know, my therapist. She was very encouraging and helped me finally work up the courage to tell my husband and a select group of friends.  I imagined a range of negative reactions that included …