Task: Analyze the tweet's emotional connotations 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 best portray 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