Friendly photo subject, or dangerous primate? Most animal experts would gladly tell you that a monkey bearing its teeth is trying to communicate signs of aggression, no matter just how cute the aggression may be. However, this picture was one of those frames taken at exactly the right moment. Flickr user hsemock caught this sleepy monkey at the end of a yawn and walked away (unscathed) with a great portrait.
Although it may appear that the subject is British, this chance encounter actually took place while the photographer was trekking through the jungles of Indonesia.