Task: Determine the prevailing emotional tone of the tweet, categorizing it as either 'neutral or no emotion' or as one or more of the given emotions (anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust) that most accurately represent the tweeter's mental state.
Tweet: Not by wrath does one kill, but by laughter.  Friedrich Nietzsche #friedrichnietzsche
This tweet contains emotions: 
joy