What piece do you keep returning to even after you've worn it out?

I've been doing this long enough that I should be sick of certain repertoire, but there's one Chopin nocturne I keep coming back to late at night, not when I'm practicing but just sitting at the piano. It's not my best playing then, and I think that's partly the point. I'm curious what non-musicians have that version of — a song, a route, a meal you're never actually finished with.