That's always an ominous question to field from a client, but especially when it's a male client and you just flipped him over onto his back...
Me(hesitantly): Yes? *Oh, no, what's he gonna say now...?*
Him(jubilantly): You know, I have two extra bones in my body!
Me: *Oh, my God! Please, PLEASE don't get weird on me now...!* Okay?
Him: Yeah, right underneath each of my outside ankle bones, do you see?
Me: Wow, you're right! How *freaky, weird, bizarre*...um, interesting.
And it's true. He had a small, superfluous bone with a knuckle-like protrusion located just inferior to the lateral malleolus of each foot. (just underneath the outside ankle-bone of each foot, to be non-anatomical!)
You just never know how these massages are going to go.