Task: Classify the mental state of the tweeter based on the tweet, determining if it is 'neutral or no emotion' or characterized by any of the provided emotions (anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust).
Tweet: — to reveal a broad smile. \n\n'Yeah, it's nice.' \n\nPursing his lips, he stifled his joyous expression in order —\n\n[@AVIATAUBE].
This tweet contains emotions: 
joy