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