Task: Categorize the tweet's emotional tone as either 'neutral or no emotion' or identify the presence of one or more of the given 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