Learn that whatever the situation is, never heckle a monkey. They have feelings and get irritated, and they are very instinctive. So if you anger or annoy a monkey it will bite, scratch or inflict other bodily harm upon you.
Take proper precautions, depending on the situation. Look around and think to yourself, "Is the monkey in a secure enclosure?" If not, "Is there a place where I can secure myself if the monkey were to attack?" Avoid operations where monkeys are on leashes or tied to trees.