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'm sorry but since when is an #indiegames #DLC worth nearly £130 that's just plain lunacy when the game itself is £20odd, #astounded 😱
This tweet contains emotions: 
anger, sadness, surprise