My roommate has the best peanut butter and I'm thinking of eating it straight from the jar.
Yuck, why would you do that?
Because I want to make him angry.
You sure will make him mad. It's rude to eat someone else's food, and it's even more rude to eat it right out of the container. If you're not a good roommate, you may find yourself out of a home.
I owned the place.
You may own the place, but he owns that jar of peanut butter. How would you like it if he messed with your things?