Task: Classify the mental state of the tweeter based on the tweet, determining if it is 'neutral or no emotion' or characterized by any of the provided emotions (anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust).
Tweet: I've always had a weird grudge against stingrays ever since one killed Steve Irwin.
This tweet contains emotions: 
anger, pessimism, sadness