Task: Identify the primary emotion conveyed in the tweet and assign it to either 'neutral or no emotion' or one or more of the provided emotions (anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust) that best capture the tweeter's mental state.
Tweet: Shantosh: How crazy would it be to walk past and talk to a person everyday never realizing he is suffering from depression or such? …
This tweet contains emotions: 
pessimism, sadness