There was a movie where two guys are captured by a group of bandoleros in a desert sort of setting. In this one particular scene, they decide to execute them, so they make them lie down tied up on their backs. Two of the bandoleros stand over the captives and decide to shoot them at the count of three. As the main guy counts to three, the men on the ground wince as they prepare to be shot. However, right as the main bandolero says “three”, he quickly turns around, squats over the one prisoner, and flatulates loudly on him. Then, the whole gang starts laughing loudly. Any clue what this movie could possibly be?