Task: Evaluate the tweet for emotional cues 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 indicate the tweeter's state of mind.
Tweet: @yap_yip --an uncertainty. [Halsey teases, her lips curving into a jovial smirk.]
This tweet contains emotions: 
joy, optimism