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: Haven't yet read why Dutch drivers are so happy, but here's my theory: because they could quit driving and still have great transpo options.
This tweet contains emotions: 
joy, optimism