Ever seen the show? There have been 2 shows with the word tickling in them and NO actual tickling? It's a shame the show is over and no actual tickling occured.
At least we still have Simpsons and Family Guy, in which there have been instances in those shows. And yeah, tickling does tend to happen in more innocent/kids shows.
Haha, I think I brought this up one time. The Peggy foot fetish episode was classic. You might be referencing this one too, but in the episode where Bobby starts hanging around with the D&D nerds, the video store has a video with a feather on the cover titled "The Tickler".