Philly used to have a great tradition known as The Big Mess Orchestra, a huge assemblage of some of the most talented and bizarre hometown performers that would get together every so often at the Trocadero for music and mayhem. Then its mastermind, Andy Bresnan, got up and moved to parts unknown. Well, he and the Big Mess are back at the Troc, at least temporarily, on December 18th and 19th for a new show, Als Die Dinosaurier Die Erde Durchsteiften (When Dinosaurs Roamed the Earth).