George Clooney and Leo DiCaprio can relax because it's unlikely anyone from the Texas BBQ Posse will challenge them for leading roles in Tinseltown. Still, we had our brush, very briefly, with video fame. And while nothing came of it -- yet, anyway -- the experience was great fun so we thought we would share it with you. About a year ago, the folks at 12 Forward Entertainment in Dallas approached the Texas BBQ Posse about making a "pitch" video for a reality TV show based on the Posse. The video would then be used to sell the concept to…