My mom called to tell me that there was an unforeseen change to a promise that she'd had made to me. It was something beyond her control and she felt really bad about it.
My mom has always been one to honor her word. As much as her promise was a gift to me, and as much as I was okay with the change, she was really upset about it.
What an inspiration for me. Even when it's not an obligation, it's important to honor your word.