Task: Evaluate the tweet for emotional cues and classify 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 indicate the tweeter's state of mind.
Tweet: Since the 'update' my @iPhone loses power nearly 40% faster.  #furious
This tweet contains emotions: 
anger, disgust, sadness