I’m not one for nostalgia, but, damn, that longing for what was hit me hard as I walked through Let There Be Gwar at Beyond the Streets on Saturday morning. Inside the La Brea Avenue gallery is a treasure trove of costumes, props and ephemera from the rock band/art collective. A massive anthropomorphic toilet and plunger stands near the front entrance. Decapitated heads line a wall, a recipe for DIY bloodbags beside them. On the TV screens are flashbacks to Gwar’s time on the 1990s talk show circuit. Joan Rivers! Jerry Springer! Wally George!