Task: Categorize the tweet's emotional expression, classifying it as either 'neutral or no emotion' or as one or more of the specified emotions (anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust) that reflect the tweeter's state of mind.
Tweet: A pessimist is someone who, when opportunity knocks, complains about the noise.
This tweet contains emotions: 
disgust, optimism, pessimism, sadness