I remember a scene on ALL MY CHILDREN when Kelly and her show/real husband are preparing the condo accross from theirs for his former wife who was hurt.
Kelly was standing on the bed hangong a sign, when Mark grabbed her ankle and appeared to give a tickle to Kelly's foot foot. She fell on the bed, laughing, with an oh no and they started snuggling and the scene ended.
Watching that, I knew Kelly was ticklish!