 Ooh, that's a good one. Yeah. I think the most obvious to me, being a chiropractor, is if you have a history of trauma that could have caused misalignments in your spine. Yeah, absolutely. And you know what? I think it's really interesting that that's the one you thought of first, because I think that's what I thought of first as well. Really? But I don't think that's what most people would think of, right? No, because they think, oh, I got rear-ended in a car accident 10 years ago, and I didn't go to the hospital, and I didn't feel pain, and so I'm okay from that. So I'm okay.