Task: Analyze the tweet's sentiment and assign it to either 'neutral or no emotion' or one or more of the specified emotions (anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust).
Tweet: @yap_yip --an uncertainty. [Halsey teases, her lips curving into a jovial smirk.]
This tweet contains emotions: 
joy, optimism