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: Just found out tonight my son will not be doing practical work counting towards his GCSE exam. OK then! I thought STEM was all the rage??
This tweet contains emotions: 
anger, pessimism