What is your favorite thing that you own?

Just the title, really. I want to know what your favorite thing that you own is — not necessarily the most expensive or impressive thing. "Favorite" can be the most useful, the most pleasant to use, or the nicest to look at.

Please don't phone it in with answers of "my wife," "my kid," or some other gotcha answer. Let's take it as read that you love your family.