Task: Identify the primary emotion conveyed in the tweet and assign it to either 'neutral or no emotion' or one or more of the provided emotions (anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust) that best capture the tweeter's mental state.
Tweet: LOL I have reminders for my ex-gf's birthday approaching. Too bad she considers me acknowledging her existence an affront...
This tweet contains emotions: 
joy