Grocery list in iMessage https://media.hachyderm.io/media_attachments/files/109/849/308/757/088/679/original/4a0b2ab98161e215.png
This might be obvious but my wife and I find this to be a super useful hack, easier than sharing notes and to do list for groceries. We text each other what we want from the store and then when we get the thing, we thumbs up it