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: i just spent $40 on big little sis tomorrow and i am beyond happy about it #SAW #mirth #mums
This tweet contains emotions: 
joy