The inside jokes.

My husband and I have many inside jokes that have evolved so much over the course of our relationship, that from an outside perspective it probably sounds like we're speaking in riddles most of the time.

We also have a face that we make at each other constantly. Towards everything. All the time. While watching Game of Thrones together, I pointed out that Gilly kind of looked like a cute little gopher. And I have an overbite myself so it's quite easy to make "the Gilly face". We do it in public and around family so much, that we often forget how ridiculous it looks and end up spontaneously busting out laughing at other people's reactions once we've realized.