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: I fear that if United bottle this my heart would actually collapse from laughter.
This tweet contains emotions: 
fear, joy, optimism, trust