Task: Analyze the tweet's emotional connotations and classify 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 best portray the tweeter's mental state.
Tweet: No red card for Gordon there? The ref must be a Celtic fan as that was a shocking challenge.
This tweet contains emotions: 
anger, anticipation, fear, surprise