Determine the valence intensity of the following tweet, considering the mental state of the author. Assign a real number between 0 and 1, where 0 denotes extremely negative and 1 denotes extremely positive.
Tweet: 462 appearances in PL and 200 goals!! 2.31 games per goal. That's very nearly a goal in every 2 games #crap 😂😂 🙄🙄🤔🤔 #Rooney