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: The return of Matt Damon, and of director Paul Greengrass, brings back all the exhilarating if rather po-faced entertainment to a movie
This tweet contains emotions: 
joy, optimism