Can I offer a positive and fun story here that fits in with the discussion and might possibly be a thrill for some of you (which is the whole reason we come to TMF, is it not?)
Many moons ago when I was younger, single and much more attractive, I discovered these store front massage places in a busy city I used to live in. I had no idea they existed and decided to see what they were all about and get a foot massage. This was one of these places where all the tables/seats were out in the open, in front of everyone else. I was in my early 20s still discovering the depths of this fetish and this GORGEOUS woman in her mid-30s worked on just my feet for 30 minutes, face down. I had never had my feet massaged professionally before. As soon as she put lotion on them I started giggling. Then I heard her giggling, at my laughing. She continued to massage my feet as my laughter and squirming grew and was clearly having a blast (we both were!) "Oh, this is so much fun!" I remember her saying. I laughed the entire 30 minutes. She laughed. She'd occasionally sneak in a nail tickle on me to really get me to laugh, then she'd say "sorry" and then I'd say "it's okay" and laugh some more. It was pure bliss. And completely non-sexual (in person, anyway).
I went back to her only two more times and then discovered she no longer worked there, so like all good things, it came to an end. But the other two times I came in she laughed and said "oh, my favorite client!" which made us both very happy.
Did I fantasize about those sessions later? Heck yes. But what also gave me pleasure was the idea that maybe SHE fantasized about them because she secretly had a tickle fetish and I was maybe making her aroused. But you know what? Maybe she didn't have this fetish. Who knows. I enjoyed it, she enjoyed it, and the tickling WASN'T sexual. She never said "oh, this is obviously turning this guy on" or "hey, this is turning ME on" or anything like that. In fact that would have RUINED this amazing experience were clearly were both having: by expressing our thoughts.
I know this is a little off the "tickling unsuspecting people" topic but the point is, it doesn't matter what was going on in each of our minds. She was happy, I was happy, no boundaries were crossed, and anything "sexual" about it was purely in my (and maybe her?) mind.
And that's the moral of my story: what goes on inside your mind is entirely your own business.