Some claim that you don't see a person's true colors until you start planning your wedding. Most of the time dealing with all of the personalities is much harder than dealing with the actual planning itself. For some reason, I've found that weddings have a way of turning even the most mild-mannered, normal human beings into Gary Busey.
Something borrowed is arguably the hardest of the four "somethings" to find for your big day. On the one hand, you'd like the item you borrow to be meaningful, but you also don't want to borrow something that's so valuable to the person you're getting it from that you spend your wedding worried about losing it.