What I mean is the thing you didn't need, just really wanted, and now you love the trout out of it. Maybe it's your TV, maybe it's your grandma's cookie recipe. I dunno, humor my curiosity.

For me it's my PS4. I'd probably save it in a fire first, and then the human being I live with after if there is time. Maybe my DC-themed underwear. I love those too. I like nerdy things. In fact, you get extra points if your answer is nerdy.