Why is my cat acting so aggressive?

i thought also it was the smell that triggered him to act so crazed out. But yes I think that so because when Oliver and Finn used to get at it , there wasn't know hissing and yowling going on but yes I think that is the problem. Did you also know that other animals (cats) get mistaken cause of one little thing? Did Oliver noticed the wood stain? If he did Oliver would have got triggered by the consuming he was a another cat. Try getting the wood stain off as soon as possible!