Task: Assess the emotional content of the tweet and classify it as either 'neutral or no emotion' or as one or more of the given emotions (anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust) that best represent the tweeter's mental state.
Tweet: A pessimist is someone who, when opportunity knocks, complains about the noise.
This tweet contains emotions: 
disgust, optimism, pessimism, sadness