From The Good, The Bad, and the Ugly, released in 1966:

(Tuco is taking a bubble bath. A one armed man, hell-bent on revenge and brandishing a gun in his one hand, sneaks into the room and gets the drop on him)

One Armed Man: I've been looking for you for 8 months. Whenever I should have had a gun in my right hand, I thought of you. Now I find you in exactly the position that suits me. I've had lots of time to learn to shoot with my left.

(Tuco kills the man with a gun he had hidden under the bubbles)

Tuco: When you have to shoot, just shoot. Don’t talk!

Think of how many bad guys would have won if they had only listened to Tuco.