(How unusual is this, seriously? I have regular borrowing-type contact with my neighbors -- they borrow from us, we borrow from them -- and have lived only one place where I didn't have that sort of contact.)
I never said we weren't back and forth with each other. I've just never had anyone borrow the cliche cup of sugar.
Actually, thinking about it, it's more like with Bill we exchange meals. Barbeque, stuffed salmon, pasta dishes.
With the neighbors 2 doors away, I go over there with davey crockett hats and hello kitty sunglasses, and they come over with books and videos.
The bf of another neighbor once gave me some homemade liquid fertilizer.