lol, I dunno if it's an INTP thing or not, but I know that I'm definitely possessive of some of my food; especially the american food that I miss from back home, because it costs about twice as much as it does back home, and it's always hit-or-miss if the grocery store is going to have it that week or month. So when I do manage to buy something that I can't easily find, I can't stand it when I have to share it.
I always end up sharing it, though; I don't like to hurt people's feelings. It really depends on the person, though. If the particular person is wanting to have some of my imported american goodies, and he/she has a good track record of sharing stuff with me, then I'm okay with it. But I have a few friends who never offer/share their stuff with me, so I just end up hiding the good stuff whenever they come over (whether it be the imported alcohol, snacks, etc., or just plain ol' weed)