“Taco Shop” (*1/2 out of four) was a stale teen comedy about a young taco-shop owner (Tyler Posey) whose business and livelihood is threatened by a rival gourmet taco truck which opens across the street leading to fierce competition and all-out war. Scattershot chuckles are dissipated by silly script which runs out of story and steam very quickly and may give you indigestion. Posey’s likeable performance is wasted. One-time great character actor Eric Roberts shows up in a minor role as one of Posey’s co-workers and mentors.