Found a great article on BMEink -- a fantastic resource for any tattoo information you could need -- on getting a foot tattoo.
She was told: "You know that's gonna hurt like a motherf*&er" -- which seems to be the accepted wisdom around foot tattoos. Any tattoo that doesn't have a lot of fat underneath it is, in fact, very likely to hurt like a motherf*&er. And there are a lot of nerves down there in the foot.