Broken promises. I don't know but people love to make promises but then break them. That totally defeats the purpose of making a promise to someone. There is a saying that goes, 'promises are meant to be kept, not broken'. I don't see why it's so difficult to keep a promise. I mean if you can't keep it then don't make it in the first place. It's really frustrating to see how promises are broken and it hurts a lot.