I remember a few years back a female friend of mine was over and we were watching a movie on the couch. she had her feet in my lap and so of course i was lightly teasing the soles of them while she giggled and watched the tv. after a bit i ran my fingers across the top of her foot and she shreiks with laughter and starts yelling, "Who told you? Who told you?" (at the time and even now i think that was hilarious) i come to find out that she cosideres the tops of her feet to be her most ticklish spot. also, she was convinsed at that time that someone had shared with me her secret. we went back to watching the movie. she even put her feet back in my lap, but only after making me promise not to touch the tops. 🙂