Some of these pictures and descriptions may give away plot details that you might not want to know before watching the film.
"Clint Eastwood…the deadliest man alive...takes on a whole army with two guns and a fistful of dynamite!"
There's a rattlesnake in an abandoned building in the Mexican desert. It's a fake snake with strings holding up its head and its tail and wiggling the rattle. As always, we hear rattling sounds. Clint Eastwood holds his boot out so the snake will strike it and when it does, he cuts its head off. Now it looks like a real but dead rattlesnake of some Mexican species. (The movie was filmed in Mexico.) He gives the body to Sara to save and cook for dinner. She takes it and goes to hide from some French soldiers who are approaching, and when one comes close to where she's hiding, she shakes the snake's rattle. This snake looks completely different from the first one. It's a real dead one of a different species. When we see her holding the snake again, it looks the same as the first one. When the soldier hears the rattling sound he turns around afraid to go any farther. Later we see them both eating the snake.