If you thought “Barnett Shale” was a character on King of the Hill, then you obviously haven’t been keeping up with the Weekly’s longtime reporting on natural gas drilling in North Texas. Tonight (Monday) at 8pm, HBO will present the broadcast premiere of Gasland, director Josh Fox’s documentary about nation-wide industry efforts to convince landowners to surrender their sod for fast cash and uncertain health and environmental consequences. North Texas drilling reportedly plays a small part in the movie, but the stories are scarily similar wherever Fox finds them.