I generally find manicures and pedicures awkward, especially if I go get them done. I'm far too clumsy to do them myself (I end up with nail polish everywhere). I hate having my feet rubbed by people I don't know; it's something really intimate to me, and I've come close to inadvertently kicking a few people while receiving a pedicure. I can't relax at all.
Manicures? I like them slightly better, but I usually have this moment where I go, "The manicurist is really attractive. The manicurist is holding my hand right now. Attractive person is holding my hand." As I tend to be rather shy, this is usually the point where I get a bit socially awkward and either try (and fail) to flirt with the manicurist, try (and fail) to make conversation, or else sit there in silence while flipping out that this person is technically holding my hand.