No one has gone further with one idea than Joe Sears and Jaston Williams, the creators of the fictional Tuna, Texas, and its theatrical offspring Greater Tuna and Red, White and Tuna. A Tuna Christmas is the third of the trio, Sears and Williams' take on a small-town Christmas. If you've seen the other two plays, you know how the story goes. If you don't, well, the plot never mattered much anyway. If you laugh uncontrollably when driving through one-pickup towns in Texas where going out to eat involves a Dairy Queen, you'll enjoy this. A Tuna Christmas happens December 22 through 27 at the Bass Performance Hall in Fort Worth. Tickets are $18-$45. Call (972) 647-5700.