tickle (http://definr.com/tickle)

     n 1: a cutaneous sensation often resulting from light stroking
     2: the act of tickling [syn: tickling, titillation]
     v 1: touch (a body part) lightly so as to excite the surface
          nerves and cause uneasiness, laughter, or spasmodic
          movements [syn: titillate]
     2: feel sudden intense sensation or emotion; "he was thrilled
        by the speed and the roar of the engine." [syn: thrill]
     3: touch or stroke lightly; "The grass tickled her calves"