Analyze the sentiment expressed in the tweet. Is it positive, negative, or neutral? Explain the sentiment in relation to the stock mentioned.
TWEET: "RT @AmericanExpress: #HappyHalloween to all the skeletons, ghouls, werewolves, witches and mere mortals! https://t.co/WtjMSvJMAS
" STOCK: American Express DATE: 31/10/2017
Sentiment: (Provide sentiment here)
Explanation: The tweet sentiment is related to the stock mentioned, and it's important to interpret the context. The LSTM polarity score is -1 and the TextBlob polarity score is -0.625.