THEATER: Luther
The very funny concept behind Luther, the second of three plays running as part of Clubbed Thumb's Summerworks festival, is that Walter (Gibson Frazier) and Marjorie (Kelly Mares) have adopted a shell-shocked veteran, Luther (Bobby Moreno), whom they treat as a cross between a teenager and a dog -- an animal who doesn't know better and therefore can't be held responsible for his actions. Ethan Lipton wants you to lau…