You can 3D print containers that fit all kind of juice/pop/milk lids. They can be any height, but my favorite are the ones that nest almost perfectly inside giving you one bottlecap worth of storage (perfect for pills or sim/sd cards).
I've had my printer for 6 months and still get a kick out of this.
I've never tried to have what I would call a conversation, but I use it as a tool for both fixing/improving writing and for writing basic scripts in autohotkey, which it's fairly good at.
It's language models are good for removing the emotional work from customer service - either giving bad news in a very detached professional way or being polite and professional when what I want is to call someone a fartknocker.