The sad sight of an empty parking lot at MeShack's Bar-B-Que on a Tuesday at 11:30am. (Photo ©Chris Wilkins) As any baseball fan knows, life is all about hitting curve balls. Constant curve balls. And so it goes with barbecue, too. The Posse re-discovered that important lesson Tuesday, the second day of its week-long "DFW Top 7 BBQ Tour," our plan to hit all of the area joints that made Texas Monthly's new Top 50 list. What started so grandly at Hutchins BBQ in McKinney on Monday, however, derailed badly in Garland. "The train went off the tracks and down…