Originally posted by: Ilmater
Most cats are, inherently, evil, lazy creatures. They spend most of their time doing absolutely nothing of use and expecting to be fed and picked up after. When they get especially bored (which seems impossible given their propensity to do nothing of note for hours) they will do things which they find bother people, like get hair on things they shouldn't, fighting with siblings/parents/etc.., or scratching things.
I say "most cats" because there are a few that are actaully attentive and seem to give a sh1t that someone is providing them with food and shelter. These cats will actually acknowledge you when you come home, etc. They behave like dogs. Therefore, you should have purchased a dog in the first place because at least a dog can go running with you or defend you if an attacker should come at you.