AU idea #1
A universe where memories are stored in every tear drop. So people rarely ever cry because if they do they might forget something really important. Crybabies make up for it by stories their tears in bottles and when they are done crying, they give themselves their memories again. Tears are precious, valuable, things and they sell tears on the black market so other people can experience the memories of strangers. It's like going on the biggest acid trip available and you can feel everything they are feeling. Often times when people actually shed true tears, it's not just because they are sad, but because they want to forget.