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: He's mixing it up pretty well..using that slider pretty affective so far #thebabybombers #yankees #offense
This tweet contains emotions: 
joy