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: Today's realisation that it was the last time I watch swimming lesson cos I go back to work next week lead to a joyous bedtime. #worstoneyet
This tweet contains emotions: 
anticipation, disgust, joy, optimism, sadness