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 had #efficient #great #smiling service @AppleBelgique store. Impressive team of geniuses ready to redefine what customer service is!
This tweet contains emotions: 
joy