Task: Categorize the tweet's emotional expression, classifying 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 reflect the tweeter's state of mind.
Tweet: Not by wrath does one kill, but by laughter.  Friedrich Nietzsche #friedrichnietzsche
This tweet contains emotions: 
joy