I have a 5 year old neutered house cat who lunges and bites. He only does this when (I think) he's mad at me for leaving for work or when he feels I'm not paying enough attention to him. Last night he was wanting to sit in my chair with me and I encouraged him to jump up. The next thing I know he had lunged and bit my arm leaving teeth marks. He first started doing this when I left on vacation for five days. I had just returned home and was unpacking in the living room. I was petting him and talking to him and next thing - he jumped at my leg and bit it. He doesn't growl, lay back his ears, or anything like that. He just jumps at me like a snake coiled up and then jumping out to bite. Is his agression his way of trying to tell me he's upset at me? Normally he's a very nice, friendly cat. Also, he loves to eat toilet paper off the roll and he also chews the newspaper ads - not the paper itself, but the crinkley, shiney department store type of ads. What's up with this guy?