I'm not sure why I remembered this just now, but there was an episode where the older teenage girls, Dana and Karen, were supposed to go on a blind double date their mom had set up for them. The guys turned out to be losers so the girls ditched them and played a joke on mom by calling from the backyard and pretending to be at a motel with them. At one point, Dana (played by Staci Keenan) starts giggling and says, "stop! you know how TICKLISH I am!" It's not actual tickling but it's still pretty cute, especially the way she hits the word "tickling."