Task: Determine the prevailing emotional tone of the tweet, categorizing 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 most accurately 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